diff --git a/bower.json b/bower.json
index ce14364..422810f 100644
--- a/bower.json
+++ b/bower.json
@@ -1,7 +1,7 @@
 {
   "name": "firebase-util",
   "description": "A set of experimental power tools for Firebase.",
-  "version": "0.0.0",
+  "version": "0.2.6",
   "authors": [
     "Firebase (https://firebase.google.com/)"
   ],
diff --git a/dist/firebase-util-normalize.min.js b/dist/firebase-util-normalize.min.js
new file mode 100644
index 0000000..051f077
--- /dev/null
+++ b/dist/firebase-util-normalize.min.js
@@ -0,0 +1,10 @@
+/*!
+ * Firebase-util:  A set of experimental power tools for Firebase.
+ *
+ * Version: 0.2.6
+ * URL: https://github.com/firebase/firebase-util
+ * Date: 2016-11-21T15:08:33.470Z
+ * License: MIT http://firebase.mit-license.org/
+ */
+require=function t(e,r,n){function i(a,o){if(!r[a]){if(!e[a]){var h="function"==typeof require&&require;if(!o&&h)return h(a,!0);if(s)return s(a,!0);var u=new Error("Cannot find module '"+a+"'");throw u.code="MODULE_NOT_FOUND",u}var c=r[a]={exports:{}};e[a][0].call(c.exports,function(t){var r=e[a][1][t];return i(r?r:t)},c,c.exports,t,e,r,n)}return r[a].exports}for(var s="function"==typeof require&&require,a=0;a<n.length;a++)i(n[a]);return i}({1:[function(t,e,r){(function(e){e.Firebase&&(e.Firebase.util=t("firebase-util"))}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"firebase-util":void 0}],2:[function(t,e,r){r.NormalizedCollection=t("./libs/NormalizedCollection.js")},{"./libs/NormalizedCollection.js":6}],3:[function(t,e,r){"use strict";function n(t,e,r){var n=this;n._ref=null,n._map=t,n._name=e,n._url=r,n.lastMergedValue=s.undef,n._obs=new s.Observable(["child_added","child_removed","child_changed","child_moved","value"],{onAdd:function(t){var e=n._obs.getObservers(t).length;1===e&&n._start(t,n._obs.getObservers().length)},onRemove:function(t){var e=n._obs.getObservers(t).length;0===e&&n._stop(t,n._obs.getObservers().length)}})}function i(t){return function(){throw new Error("Classes implementing AbstractRecord must declare "+t)}}var s=t("../../common/");n.prototype={_start:i("_start"),_stop:i("_stop"),hasChild:i("hasChild"),forEachKey:i("forEach"),getChildSnaps:i("getChildSnaps"),mergeData:i("mergeData"),getClass:i("getClass"),saveData:i("saveData"),getPriority:i("getPriority"),makeChild:i("makeChild"),watch:function(t,e,r,n){this._obs.observe(t,e,r,n)},unwatch:function(t,e,r){this._obs.stopObserving(t,e,r)},getFieldMap:function(){return this._map},getPathManager:function(){return this._map.getPathManager()},setRef:function(t){this._ref=t},getRef:function(){return this._ref},child:function(t){return this.getRef().ref().child(t).$getRecord()},getName:function(){return this._name},getUrl:function(){return this._url},trigger:function(t){s.log.debug("AbstractRecord._trigger: %s",t.toString()),this._obs.triggerEvent(t.event,t.create(this.getRef()))},_cancel:function(t){s.error(t),this._obs.abortObservers(t)}},e.exports=n},{"../../common/":19}],4:[function(t,e,r){"use strict";function n(t){this.fields={},this.length=0,this.pathMgr=t}function i(t,e){return u.find(t,function(t){return t.pathName===e.path&&t.id===e.field})||null}function s(t){this.path=t.path,this.id=t.id,this.key=t.key,this.alias=t.alias,this.url=t.url,this.pathName=t.pathName,this.isNested=t.alias.indexOf(".")>=0}function a(t,e){if(t instanceof s)return u.pick(t,["path","id","key","alias","pathName","url"]);"string"==typeof t&&(t={key:t});var r=t.key.split("."),n=e.getPath(r[0]);return{pathName:r[0],id:r[1],key:t.key,alias:t.alias||r[1],path:n,url:n?n.url()+"/"+r[1]:null}}function o(t,e,r){if(null!==r){if(e.indexOf(".")>0){for(var n,i=e.split(".").reverse();i.length>1&&(n=i.pop());)t=t[n]=u.has(t,n)?t[n]:{};e=i.pop()}t[e]=r}}function h(t,e){var r=e;if(!u.isObject(t))return u.undef;var n=t[e];if(e.indexOf(".")>0){var i=e.split(".").reverse();for(n=t;i.length;)r=i.pop(),n=u.isObject(n)&&n.hasOwnProperty(r)?n[r]:u.undef}return n}var u=t("../../common"),c=t("./PathManager");n.prototype={add:function(t){var e=new s(a(t,this.pathMgr));if(this.fields.hasOwnProperty(e.alias))throw new Error("Duplicate field alias "+e.alias+"("+e.key+")");if(null===e.path)throw new Error("Invalid path specified for field "+e.key+"; it was not in the paths provided, which are : "+this.pathMgr.getPathNames().join(","));var r=e.path.getDependency();if(null!==r&&null===i(this.fields,r))throw new Error("Dynamic paths must reference a field declared in the map. Please add "+n.key(r.path,r.field)+" to the select() criteria before using it in a dynamic field");this.fields[e.alias]=e,this.length++},forEach:function(t,e){return u.find(this.fields,t,e)!==u.undef},getField:function(t){return this.fields[t]||null},getPath:function(t){return this.getPathManager().getPath(t)},getPathManager:function(){return this.pathMgr},pathFor:function(t){var e=this.getField(t);return e?e.path:this.pathMgr.first()},fieldsFor:function(t){return u.filter(u.toArray(this.fields),function(e){return e.pathName===t})},aliasFor:function(t){var e=u.find(this.fields,function(e){return e.url===t},this);return e?e.alias:null},extractData:function(t,e){var r={},n=this.pathMgr.getPathName(t.ref().toString());if(null===n&&null!==t.ref().parent()){var i=this.pathMgr.getPathFor(t.ref().parent().toString());i&&i.hasDependency()&&(n=i.name())}var s=e?"exportVal":"val";return u.each(this.fieldsFor(n),function(e){switch(e.id){case"$key":o(r,e.alias,t.key());break;case"$value":o(r,e.alias,t[s]());break;default:t.hasChild(e.id)&&o(r,e.alias,t.child(e.id)[s]())}}),r},snapFor:function(t,e){var r,n=this.pathFor(e);if(!n)return null;var s=n.getDependency();if(null!==s){var a=i(this.fields,s),o=this.snapFor(t,a.alias);o&&(r="$key"===s.field?n.child(o.key()).url():"$value"===s.field?n.child(o.val()).url():n.child(o.child(s.field).val()).url())}else r=n.url();return r?u.find(t,function(t){return t.ref().toString()===r})||null:null},denest:function(t){var e={};return u.each(this.getPathManager().getPaths(),function(t){e[t.name()]={path:t,data:{}}}),this.forEach(function(r){var n=h(t,r.alias);if(n!==u.undef)switch(r.id){case"$value":e[r.pathName].data=n;break;case"$key":break;default:e[r.pathName].data[r.id]=n}}),e},idFor:function(t){var e=this.getField(t);return e?e.id:t}},n.key=function(t,e){return"string"!=typeof t&&(t=t.name()),t+"."+e},n.fieldMap=function(t,e){var r,i=t.getField(e);i?(r=i.path,"$value"!==i.id&&(r=r.child(i.id))):r=t.pathFor(e).child(e);var s=new c([r]),a=new n(s);return a.add({key:n.key(r,"$value"),alias:e}),a},n.recordMap=function(t,e){var r=t.getPathManager(),i=u.map(r.getPaths(),function(t){return t.normChild(e)}),s=new n(new c(i));return t.forEach(function(t){s.add({key:t.key,alias:t.alias})}),s},e.exports=n},{"../../common":19,"./PathManager":10}],5:[function(t,e,r){"use strict";function n(){this.criteria=[],s.each(arguments,this.add,this)}function i(t){this.match=t}var s=t("../../common");n.prototype={add:function(t){this.criteria.push(new i(t))},test:function(t,e,r){return s.contains(this.criteria,function(n){return!n.test(t,e,r)})===!1}},i.prototype.test=function(t,e,r){return this.match(t,e,r)===!0},e.exports=n},{"../../common":19}],6:[function(t,e,r){"use strict";function n(t){i(arguments),this.pathMgr=new u(h.toArray(arguments)),this.map=new l(this.pathMgr),this.filters=new c,this.finalized=!1}function i(t){function 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Perhaps you have put the wrong path first in the list?");if(a.has(this.pathsByUrl,e.url()))throw new Error("Duplicate path: "+e.url());if(a.contains(this.pathNames,e.name()))throw new Error("Duplicate path name. The .key() value for each path must be unique, or you can give each a path an alias by using [firebaseRef, alias] in the constructor. The aliases must also be unique.");this._map(e),this.paths.push(e),this.pathsByUrl[e.url()]=e.name(),this.pathNames.push(e.name())},count:function(){return this.paths.length},first:function(){return this.paths[0]},getPath:function(t){return a.find(this.paths,function(e){return e.name()===t})||null},getPathFor:function(t){var e=this.getPathName(t);return e?this.getPath(e):null},getPaths:function(){return this.paths.slice()},getPathName:function(t){return this.pathsByUrl[t]||null},getPathNames:function(){return this.pathNames.slice()},getUrls:function(){return a.keys(this.pathsByUrl)},getDependencyGraph:function(){return a.extend(!0,this.deps)},_map:function(t){var e=this.first(),r=t.getDependency();!r&&e&&(r={path:e.name(),field:"$key"}),r&&(this.deps[t.name()]=r,this._assertNotCircularDep(t.name()))},_assertNotCircularDep:function(t){for(var e=[t],r=this.deps[t];a.isDefined(r);){var n=r.path;if(a.contains(e,n))throw e.push(n),new Error("Circular dependencies in paths: 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e=t.getPathManager().first().id(),r=f.mergeToString(t.getPathManager().getUrls());this._super(t,e,r),this._eventManagers={},f.log.debug("Record created",this.getName(),this.getUrl())}function i(t){this.rec=t,this.pm=t.getPathManager(),this.running=!1,this._init()}function s(t,e){this.event=t,this.rec=e,this.map=e.getFieldMap(),this.pm=e.getPathManager(),this.subs=[],this.dyno=null}function a(t,e,r,n){var i=t.getDependency(),s=e.getPath(i.path),a=s.ref();if("$key"===i.field)throw new Error("Dynamic paths do not support $key (you should probably just join on this path)");"$value"!==i.field&&(a=a.child(i.field));var o,h=a.on("value",function(e){o&&o.key()!==e.val()&&(f.log.debug("Record.Dyno: stopped monitoring %s",o.toString()),o.off(r,n),n(null)),null!==e.val()&&(o=t.ref().child(e.val()),o.on(r,n),f.log("Record.Dyno: monitoring %s",o.toString()))});this.dispose=function(){a.off("value",h),o&&o.off(r,n)}}function 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i.forEach(function(s){var a=i.snapFor(t,s.alias);return!!n(a,s.id)&&e.call(r,s.id,s.alias)===!0})},mergeData:function(t,e){var r=null,n=this.getFieldMap();return t.length>0&&null!==t[0].val()&&(r=f.extend.apply(null,f.map(t,function(t){return n.extractData(t,e)})),e&&null!==r&&null!==t[0].getPriority()&&(f.isObject(r)||(r={".value":r}),r[".priority"]=t[0].getPriority())),r},getPriority:function(t){return t[0].getPriority()},getClass:function(){return n},saveData:function(t,e){var r=f.queue(),n=this.getFieldMap(),i=this.getPathManager().getPaths();if(e.isUpdate&&!f.isObject(t))throw new Error("First argument to update() command must be an object");if(null===t)f.each(i,function(t){t.hasDependency()||t.reff().remove(r.getHandler())});else if(f.isObject(t)){var s=n.denest(t);f.each(s,function(t){var a=t.path,h=t.data,u=this._writeRef(s,a);null!==u?f.isEmpty(h)&&e.isUpdate||(f.isObject(h)||(h={".value":h}),e.isUpdate||o(n,a,h),f.isDefined(e.priority)&&(h[".priority"]=e.priority),f.has(h,".value")?u.set(h,r.getHandler()):u.update(h,r.getHandler())):f.log.info("No dynamic key found for master",i[0].ref().toString(),"with dynamic path",a.ref().toString())},this)}else{if(1!==i.length)throw new Error("Cannot set multiple paths to a non-object value. Since this is a NormalizedCollection, the data will be split between the paths. But I can't split a primitive value");f.isDefined(e.priority)?i[0].ref().setWithPriority(t,e.priority,r.getHandler()):i[0].ref().set(t,r.getHandler())}r.handler(e.callback||f.noop,e.context)},getName:function(){return this._name},getUrl:function(){return this._url},_start:function(t){f.has(this._eventManagers,t)||(f.log.debug("Record._start: event=%s, url=%s",t,this.getUrl()),this._eventManagers[t]="value"===t?new i(this):new s(t,this)),this._eventManagers[t].start()},_stop:function(t){f.has(this._eventManagers,t)&&(f.log.debug("Record._stop: event=%s, url=%s",t,this.getUrl()),this._eventManagers[t].stop())},_writeRef:function(t,e){var r=e.reff(),n=e.getDependency();if(null!==n){var i=this.getPathManager().getPath(n.path),s=this._depKey(t,i,n.field);r=null===s?null:r.child(s)}return r},_depKey:function(t,e,r){var n,i=t[e.name()].data;switch(r){case"$key":n=e.id();break;case"$value":n=f.has(i,".value")?i[".value"]:f.isEmpty(i)?null:i;break;default:n=f.has(i,r)?i[r]:null}var s=typeof n;if(null!==n&&"string"!==s)throw new Error("Dynamic key values must be a string. Type was "+s+" for "+e.ref().toString()+"->"+r);return n}}),i.prototype={start:function(){this.running||(this.running=!0,f.each(this.pm.getPathNames(),this._startPath,this))},stop:function(){this.running&&(this.running=!1,f.each(this.subs,function(t){t()}),this._init())},update:function(t,e){this.snaps[t]=e,this._checkLoadState(),f.log("Record.ValueEventManager.update: url=%s, loadCompleted=%s",e.ref().toString(),this.loadCompleted),this.loadCompleted&&this.rec.trigger(new l("value",this.rec.getName(),f.toArray(this.snaps)))},_startPath:function(t){var e=this,r=e.pm.getPath(t),n=f.bind(e.update,e,t);if(r.hasDependency()){var i=new a(r,this.rec.getFieldMap(),"value",n);this.subs.push(i.dispose)}else r.ref().on("value",n),e.subs.push(function(){r.ref().off("value",n)})},_checkLoadState:function(){if(!this.loadCompleted){var t=this.snaps,e=this.pm.getPathNames();this.loadCompleted=!f.contains(e,function(e){return!t.hasOwnProperty(e)})}},_init:function(){this.loadCompleted=!1,this.snaps={},this.subs=[]}},s.prototype={start:function(){f.each(this.pm.getPathNames(),function(t){var e=this.event,r=this.pm.getPath(t),n=f.bind(this.update,this);r.hasDependency()?(this.dyno=new a(r,this.map,e,n),this.subs.push(this.dyno.dispose)):(r.ref().on(e,n),this.subs.push(function(){r.ref().off(e,n)}))},this)},stop:function(){f.each(this.subs,function(t){t()}),this.subs=[]},update:function(t,e){null!==t&&null!==this.map.aliasFor(t.ref().toString())&&(f.log("Record.ChildEventManager.update: event=%s, key=%s/%s",this.event,t.ref().parent().key(),t.key()),this.rec.trigger(new l(this.event,t.key(),t,e)))}},e.exports=n},{"../../common":19,"./AbstractRecord":3,"./FieldMap":4,"./RecordField":13,"./SnapshotFactory":16}],13:[function(t,e,r){"use strict";function n(t){if(this.handlers={},this.path=t.getPathManager().first(),this._super(t,this.path.name(),this.path.url()),1!==t.getPathManager().count())throw new Error("RecordField must have exactly one path, but we got "+t.getPathManager().count());if(1!==t.length)throw new Error("RecordField must have exactly one field, but we found "+t.length);u.log.debug("RecordField created",this.getName(),this.getUrl())}function i(t){return t.callback?function(){t.callback.apply(t.context,arguments)}:u.noop}var s=t("./PathManager"),a=t("./FieldMap"),o=t("./AbstractRecord"),h=t("./SnapshotFactory"),u=t("../../common");u.inherits(n,o,{makeChild:function(t){var e=new s([this.path.child(t)]),r=new a(e);return r.add({key:a.key(e.first(),"$value"),alias:t}),new n(r)},hasChild:function(t,e){return t[0].hasChild(e)},getChildSnaps:function(t,e){return[t[0].child(e)]},mergeData:function(t,e){return e?t[0].exportVal():t[0].val()},getPriority:function(t){return t[0].getPriority()},forEachKey:function(t,e,r){var n=t[0];return n.forEach(function(t){e.call(r,t.key(),t.key())})},saveData:function(t,e){var r=this.path.ref();if(e.isUpdate){if(!u.isObject(t))throw new Error("When using update(), the data must be an object.");u.has(e,"priority")&&(t[".priority"]=e.priority),r.update(t,i(e))}else u.has(e,"priority")?r.setWithPriority(t,e.priority,i(e)):r.set(t,i(e))},getClass:function(){return n},_start:function(t){var e=this;this.handlers[t]=function(r,n){e.trigger(new h(t,r.key(),r,n))},this.path.ref().on(t,this.handlers[t],this._cancel,this)},_stop:function(t){this.handlers.hasOwnProperty(t)&&this.path.ref().off(t,this.handlers[t],this)}}),e.exports=n},{"../../common":19,"./AbstractRecord":3,"./FieldMap":4,"./PathManager":10,"./SnapshotFactory":16}],14:[function(t,e,r){"use strict";function n(t,e){var r=a.mergeToString(t.getPathManager().getPathNames()),n=a.mergeToString(t.getPathManager().getUrls());this._super(t,r,n),this.filters=e,this.monitor=new h(this)}var i=t("./Record"),s=t("./AbstractRecord"),a=t("../../common"),o=t("./FieldMap"),h=t("./RecordSetEventManager");a.inherits(n,s,{makeChild:function(t){var e=o.recordMap(this.getFieldMap(),t);return new i(e)},hasChild:function(t,e){return a.contains(t,function(t){return t.key()===e})},getChildSnaps:function(t,e){return a.filter(t,function(t){return t.key()===e})},mergeData:function(t,e){var r=this,n=null;return t.length&&null!==t[0].val()&&(n={},a.each(t,function(t){null!==t.val()&&r.filters.test(t.val(),t.key(),t.getPriority())&&(n[t.key()]=e?t.exportVal():t.val())})),n},getPriority:function(){return null},forEachKey:function(t,e,r){t.forEach(function(t){return e.call(r,t.key(),t.key())})},getClass:function(){return n},saveData:function(t,e){var r=a.queue();if(null===t)a.each(this.getPathManager().getPaths(),function(t){t.ref().remove(r.getHandler())});else{if(!a.isObject(t))throw new Error("Calls to set() or update() on a NormalizedCollection must pass either null or an object value. There is no way to split a primitive value between the paths");a.each(t,function(t,n){if(".value"===n||".priority"===n)throw new Error("Cannot use .priority or .value on the root path of a NormalizedCollection. You probably meant to sort the records anyway (i.e. one level lower).");this.child(n).saveData(t,{isUpdate:e.isUpdate,callback:r.getHandler()})},this),e.priority&&this.getPathManager().first().ref().setPriority(e.priority,r.getHandler())}r.handler(e.callback||a.noop,e.context)},_getChildKey:function(t,e,r){var n=r,i=this.getPathManager().getPathFor(t.ref().toString());if(i.hasDependency()){var s=i.getDependency(),o=this.getFieldMap().getPath(s.path);if(!o)throw new Error("Invalid dependency path. "+t.ref.toString()+" depends on "+s.path+", but that alias does not exist in the paths provided.");var h=a.find(e,function(t){return t.ref().toString()===o.url()});h?(h=h.child(r),"$value"!==s.field&&(h=h.child(s.field)),n=h.val()):n=null}return n},_start:function(){this.monitor.start()},_stop:function(t,e){0===e&&this.monitor.stop()}}),e.exports=n},{"../../common":19,"./AbstractRecord":3,"./FieldMap":4,"./Record":12,"./RecordSetEventManager":15}],15:[function(t,e,r){"use strict";function n(t){var e=t.getPathManager();this.masterRef=e.first().ref(),this.url=this.masterRef.toString(),this.recList=new i(t,this.url),this.running=!1}function i(t,e){this.obs=t,this.url=e,this._reset()}var s=t("./SnapshotFactory"),a=t("../../common");n.prototype={start:function(){return this.running||(a.log("RecordSetEventManager: Loading normalized records from master list %s",this.url),this.running=!0,this.masterRef.on("child_added",this._add,this),this.masterRef.on("child_removed",this._remove,this),this.masterRef.on("child_moved",this._move,this),this.masterRef.once("value",this.recList.masterPathLoaded,this.recList)),this},stop:function(){return this.running&&(a.log("RecordSetEventManager: Stopped monitoring master list %s",this.url),this.running=!1,this.masterRef.off("child_added",this._add,this),this.masterRef.off("child_removed",this._remove,this),this.masterRef.off("child_moved",this._move,this),this.recList.unloaded()),this},_add:function(t,e){this.recList.add(t.key(),e)},_remove:function(t){this.recList.remove(t.key())},_move:function(t,e){this.recList.move(t.key(),e)}},i.prototype={add:function(t,e){a.log.debug("RecordList.add: key=%s, prevChild=%s",t,e);var r=this.obs.child(t),n=a.bind(this._valueUpdated,this,t);this.loading[t]={rec:r,prev:e,fn:n,unwatch:function(){r.unwatch("value",n)}},this.loadComplete||this.initialKeysLeft.push(t),r.watch("value",n)},remove:function(t){a.log.debug("RecordList.remove: key=%s",t);var e=this._dropRecord(t);null!==e&&this._notify("child_removed",t,e)},move:function(t,e){if(a.has(this.recs,t)){var r=a.indexOf(this.recIds,t);this.recIds.splice(r,1),this._putAfter(t,e),this._notify("child_moved",t)}},masterPathLoaded:function(){a.log.debug("RecordList: Initial data has been loaded from master list at %s",this.url),this.masterLoaded=!0,this._checkLoadState()&&this._notifyValue()},unloaded:function(){this._reset()},findKey:function(t){return a.indexOf(this.recIds,t)},_reset:function(){a.each(this.recs,function(t,e){this.remove(e)},this),a.each(this.filtered,function(t,e){this._dropRecord(e)},this),a.each(this.loading,function(t,e){this._dropRecord(e)},this),this.recs={},this.recIds=[],this.snaps={},this.loading={},this.filtered={},this.loadComplete=!1,this.initialKeysLeft=[],this.masterLoaded=!1},_valueUpdated:function(t,e){var r;this.snaps[t]=e,a.has(this.loading,t)?(r=this.loading[t],delete this.loading[t],this._processAdd(e,r)):a.has(this.recs,t)?(r=this.recs[t],this._processChange(e,r)):a.has(this.filtered,t)?null!==e.val()&&this.obs.filters.test(e.val(),t,e.getPriority())&&(r=this.filtered[t],delete this.filtered[t],a.log("RecordList: Unfiltered key %s",t),this._processAdd(e,r)):a.log("RecordList: Orphan key %s ignored. Probably a concurrent edit.",t)},_processAdd:function(t,e){var r=t.key();this.obs.filters.test(t.val(),r,t.getPriority())?(this.recs[r]=e,this._putAfter(r,e.prev),this._notify("child_added",r)):(a.log("RecordList: Filtered key %s",r),this.filtered[r]=e),this._checkLoadState(r)&&this._notifyValue()},_processChange:function(t,e){if(null!==t.val()){var r=t.key();this.obs.filters.test(t.val(),r,t.getPriority())?this._notify("child_changed",r):(delete this.recs[r],this.filtered[r]=e,this._notify("child_removed",r,this.snaps[r]))}},_notify:function(t,e,r){var n;"child_added"!==t&&"child_moved"!==t||(n=this._getPrevChild(e)),a.log("RecordList._notify: event=%s, key=%s, prev=%s",t,e,n);var i=new s(t,e,r||this.snaps[e],n);this.obs.trigger(i),this._notifyValue()},_notifyValue:function(){if(this.loadComplete){a.log.debug("RecordList._notifyValue: snap_keys=%s",a.keys(this.snaps));var t=new s("value",null,a.toArray(this.snaps));this.obs.trigger(t)}},_getPrevChild:function(t){if(!this.recIds.length)return null;var e=this.findKey(t);return e===-1?this.recIds[this.recIds.length-1]:0===e?null:this.recIds[e-1]},_posFor:function(t){var e,r;return null===t?e=0:(r=this.findKey(t),e=r===-1?this.recIds.length:r+1),e},_putAfter:function(t,e){var r=this._posFor(e);this.recIds.splice(r,0,t)},_dropRecord:function(t){var e=null;return this.recs[t]&&(e=this.snaps[t],this.recs[t].unwatch()),this.loading[t]&&this.loading[t].unwatch(),a.has(this.filtered,t)&&this.filtered[t].unwatch(),delete this.loading[t],delete this.snaps[t],delete this.filtered[t],delete this.recs[t],a.remove(this.recIds,t),e},_checkLoadState:function(t){return!(this.loadComplete||(t&&a.remove(this.initialKeysLeft,t),this.initialKeysLeft.length||!this.masterLoaded))&&(this.loadComplete=!0,
+!0)}},e.exports=n},{"../../common":19,"./SnapshotFactory":16}],16:[function(t,e,r){"use strict";function n(t,e,r,n){this.event=t,this.key=e,this.snaps=s(r),this.prevChild=n,i(this)}function i(t){switch(t.event){case"value":break;case"child_added":case"child_moved":if("string"!=typeof t.key||!t.key)throw new Error("Invalid trigger key "+t.key);if(t.prevChild===a.undef)throw new Error("Triggers must provide a valid prevChild value for child_added and child_moved events");break;case"child_removed":case"child_changed":if("string"!=typeof t.key||!t.key)throw new Error("Invalid trigger key "+t.key);break;default:throw new Error("Invalid trigger event type: "+t.event)}}function s(t){return t instanceof o?t._snaps.slice():a.isArray(t)?t.slice():[t]}var a=t("../../common"),o=t("./NormalizedSnapshot.js");n.prototype.create=function(t){var e;return e="value"===this.event?new o(t,this.snaps):new o(t.ref().child(this.key),this.snaps)},n.prototype.toString=function(){return a.printf("SnapshotFactory(event=%s, key=%s, numberOfSnapshots=%s, prevChild=%s",this.event,this.key,this.snaps.length,this.prevChild===a.undef?"undefined":this.prevChild)},e.exports=n},{"../../common":19,"./NormalizedSnapshot.js":8}],17:[function(t,e,r){"use strict";var n=t("../../common"),i=t("./PathManager"),s=t("./Path"),a=t("./FieldMap"),o=t("./RecordSet");e.exports={replicate:function(t,e){var r=t.getPathManager().getPaths().slice(0),h=r[0];r[0]=new s([e,h.name(),h.getDependency()]);var u=new i(n.map(r,function(t){return t.clone()})),c=new a(u);t.getFieldMap().forEach(c.add,c);var l,f=t.getClass();return l=f===o?new f(c,t.filters):new f(c)}}},{"../../common":19,"./FieldMap":4,"./Path":9,"./PathManager":10,"./RecordSet":14}],18:[function(t,e,r){var n=t("./index.js");r.log=n.log,r.logLevel=n.logLevel,r.escapeEmail=n.escapeEmail},{"./index.js":19}],19:[function(t,e,r){var n=t("./libs/util.js"),i=t("./libs/logger.js");n.extend(r,n,{args:t("./libs/args.js"),log:i,logLevel:i.logLevel,Observable:t("./libs/Observable.js"),Observer:t("./libs/Observer.js"),queue:t("./libs/queue.js")})},{"./libs/Observable.js":20,"./libs/Observer.js":21,"./libs/args.js":22,"./libs/logger.js":23,"./libs/queue.js":24,"./libs/util.js":25}],20:[function(t,e,r){"use strict";function n(t,e){e||(e={}),this._observableProps=o(t,e),this.resetObservers()}function i(t,e){h.each(e,function(e){var r=h.indexOf(t,e);r>=0&&t.splice(r,1)})}function s(t,e){var r=[];return h.each(e,function(e){h.has(t.observers,e)?t.observers[e].length&&(r=r.concat(t.observers[e])):c.warn("Observable.hasObservers: invalid event type %s",e)}),r}function a(t,e,r){h.has(e.oneTimeResults,t)&&r.notify.apply(r,e.oneTimeResults[t])}function o(t,e){return h.extend({onAdd:h.noop,onRemove:h.noop,onEvent:h.noop,oneTimeEvents:[]},e,{eventsMonitored:t,observers:{},oneTimeResults:{}})}var h=t("./util.js"),u=t("./args.js"),c=t("./logger.js"),l=t("./Observer.js");n.prototype={observe:function(t,e,r,n){var i,s=u("observe",arguments,2,4);return t=s.nextFromReq(this._observableProps.eventsMonitored),t&&(e=s.nextReq("function"),r=s.next("function"),n=s.next("object"),i=new l(this,t,e,n,r),this._observableProps.observers[t].push(i),this._observableProps.onAdd(t,i),this.isOneTimeEvent(t)&&a(t,this._observableProps,i)),i},hasObservers:function(t){return this.getObservers(t).length>0},stopObserving:function(t,e,r){var n=u("stopObserving",arguments);t=n.next(["array","string"],this._observableProps.eventsMonitored),e=n.next(["function"]),r=n.next(["object"]),h.each(t,function(t){var n=[],s=this.getObservers(t);h.each(s,function(i){i.matches(t,e,r)&&(i.notifyCancelled(null),n.push(i))},this),i(this._observableProps.observers[t],n),n.length&&this._observableProps.onRemove(t,n)},this)},abortObservers:function(t){var e=[];if(this.hasObservers()){var r=this.getObservers().slice();h.each(r,function(r){r.notifyCancelled(t),e.push(r)},this),this.resetObservers(),e.length&&this._observableProps.onRemove(this.event,e)}},getObservers:function(t){return t=u("getObservers",arguments).listFrom(this._observableProps.eventsMonitored,!0),s(this._observableProps,t)},triggerEvent:function(t){var e=u("triggerEvent",arguments),r=e.listFromWarn(this._observableProps.eventsMonitored,!0),n=e.restAsList();r&&h.each(r,function(e){if(this.isOneTimeEvent(t)){if(h.isArray(this._observableProps.oneTimeResults,t))return void c.warn("One time event was triggered twice, should by definition be triggered once",t);this._observableProps.oneTimeResults[t]=n}var r=this.getObservers(e),i=0;h.each(r,function(t){t.notify.apply(t,n.slice(0)),i++}),this._observableProps.onEvent.apply(null,[e,i].concat(n.slice(0)))},this)},resetObservers:function(){h.each(this._observableProps.eventsMonitored,function(t){this._observableProps.observers[t]=[]},this)},isOneTimeEvent:function(t){return h.contains(this._observableProps.oneTimeEvents,t)},observeOnce:function(t,e,r,n){var i,s=u("observeOnce",arguments,2,4);return t=s.nextFromWarn(this._observableProps.eventsMonitored),t&&(e=s.nextReq("function"),r=s.next("function"),n=s.next("object"),i=new l(this,t,e,n,r,(!0)),this._observableProps.observers[t].push(i),this._observableProps.onAdd(t,i),this.isOneTimeEvent(t)&&a(t,this._observableProps,i)),i}},e.exports=n},{"./Observer.js":21,"./args.js":22,"./logger.js":23,"./util.js":25}],21:[function(t,e,r){"use strict";function n(t,e,r,n,i,s){if("function"!=typeof r)throw new Error("Must provide a valid notifyFn");this.observable=t,this.fn=r,this.event=e,this.cancelFn=i||function(){},this.context=n,this.oneTimeEvent=!!s}var i=t("./util.js");n.prototype={notify:function(){var t=i.toArray(arguments);this.fn.apply(this.context,t),this.oneTimeEvent&&this.observable.stopObserving(this.event,this.fn,this.context)},matches:function(t,e,r){return i.isArray(t)?i.contains(t,function(t){return this.matches(t,e,r)},this):!(t&&t!==this.event||e&&e!==this&&e!==this.fn||r&&r!==this.context)},notifyCancelled:function(t){this.cancelFn.call(this.context,t||null)}},e.exports=n},{"./util.js":25}],22:[function(t,e,r){"use strict";function n(t,e,r,i){if("string"!=typeof t||!h.isObject(e))throw new Error("Args requires at least 2 args: fnName, arguments[, minArgs, maxArgs]");if(!(this instanceof n))return new n(t,e,r,i);this.fnName=t,this.argList=h.toArray(e),this.origArgs=h.toArray(e);var 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diff --git a/dist/firebase-util-paginate.min.js b/dist/firebase-util-paginate.min.js
new file mode 100644
index 0000000..4b660b7
--- /dev/null
+++ b/dist/firebase-util-paginate.min.js
@@ -0,0 +1,10 @@
+/*!
+ * Firebase-util:  A set of experimental power tools for Firebase.
+ *
+ * Version: 0.2.6
+ * URL: https://github.com/firebase/firebase-util
+ * Date: 2016-11-21T15:08:32.518Z
+ * License: MIT http://firebase.mit-license.org/
+ */
+require=function t(e,n,r){function i(o,a){if(!n[o]){if(!e[o]){var u="function"==typeof require&&require;if(!a&&u)return u(o,!0);if(s)return s(o,!0);var h=new Error("Cannot find module '"+o+"'");throw h.code="MODULE_NOT_FOUND",h}var c=n[o]={exports:{}};e[o][0].call(c.exports,function(t){var n=e[o][1][t];return i(n?n:t)},c,c.exports,t,e,n,r)}return n[o].exports}for(var s="function"==typeof require&&require,o=0;o<r.length;o++)i(r[o]);return i}({1:[function(t,e,n){(function(e){e.Firebase&&(e.Firebase.util=t("firebase-util"))}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"firebase-util":void 0}],2:[function(t,e,n){"use strict";function r(t,e,n){var r=s.extend({},h,t);return r.maxCacheSize||(r.maxCacheSize=3*r[e]),i(r,e,n),i(r,"maxCacheSize",n),r}function i(t,e,n){if("number"!=typeof t[e])throw new Error("Argument "+e+" passed into opts for "+n+"must be a number")}var s=t("../common"),o=t("./libs/Scroll.js"),a=t("./libs/Paginate.js"),u=t("./libs/ReadOnlyRef.js"),h={field:null,pageSize:10,windowSize:250};n.Scroll=function(t,e,n,i){if(!s.isFirebaseRef(t)||s.isQueryRef(t))throw new Error("First argument to Firebase.util.Scroll must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).");if("string"!=typeof e)throw new Error("Second argument to Firebase.util.Scroll must be a valid string");if(arguments.length>2&&!s.isObject(n))throw new Error("Optional third argument to Firebase.util.Scroll must be an object of key/value pairs");var a=new u(t);return a.scroll=new o(a,e,r(n,"windowSize","Scroll"),i),a},n.Paginate=function(t,e,n){if(!s.isFirebaseRef(t)||s.isQueryRef(t))throw new Error("First argument to Firebase.util.Paginate must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).");if("string"!=typeof e)throw new Error("Second argument to Firebase.util.Paginate must be a valid string");if(arguments.length>2&&!s.isObject(n))throw new Error("Optional third argument to Firebase.util.Paginate must be an object of key/value pairs");var i=new u(t);return i.page=new a(i,e,r(n,"pageSize","Paginate")),i}},{"../common":9,"./libs/Paginate.js":5,"./libs/ReadOnlyRef.js":6,"./libs/Scroll.js":7}],3:[function(t,e,n){"use strict";function r(t,e,n,r){i.log.debug("Cache: caching %s using field=%s maxRecordsLoaded=%d",t.toString(),e,n),this.offset=new s({field:e,max:n,ref:t.ref()}),this.outRef=t,this.inRef=null,this.queryRef=null,this.countRef=null,this.keys={},this.start=0,this.count=-1,this.endCount=-1,this.nextListeners=[],this.offset.observe(this._keyChange,this),this.desc=r}var i=t("../../common"),s=t("./Offset");r.prototype.moveTo=function(t,e){i.log.debug("Cache.moveTo: startOffset=%d, numberOfRecords=%d",t,e);var n=this.start,r=this.count;this.start=t,this.count=e,this.endCount=this.start+this.count,n!==this.start?this.offset.goTo(t,e):r!==this.count&&this._refChange()},r.prototype.hasNext=function(){return this.count===-1||this.endCount>this.start+this.count},r.prototype.hasPrev=function(){return this.start>0},r.prototype.observeHasNext=function(t,e){var n=this.nextListeners,r=[t,e];return n.push(r),function(){i.remove(n,r)}},r.prototype.destroy=function(){this._unsubscribe(),this.offset.destroy(),this.offset=null,this.start=0,this.count=-1,this.inRef=null,this.outRef=null,this.queryRef=null,this.countRef=null,this.keys=null,this.nextListeners=null},r.prototype._keyChange=function(t,e,n){this.inRef=n,i.log.debug("Cache._keyChange: %s %s %s",t,e,n.toString()),this._refChange()},r.prototype._unsubscribe=function(){this.queryRef&&(this.queryRef.off("child_added",this._add,this),this.queryRef.off("child_removed",this._remove,this),this.queryRef.off("child_moved",this._move,this),this.queryRef.off("child_changed",this._change,this),this.queryRef.off("value",this._value,this),this.queryRef.off("value",this._removeOrphans,this),this.queryRef=null),this.countRef&&(this.countRef.off("value",this._count,this),this.countRef=null)},r.prototype._refChange=function(){this._unsubscribe(),this.inRef&&this.count>-1&&(this.countRef=this.desc?this.inRef.limitToLast(this.count+1):this.inRef.limitToFirst(this.count+1),this.countRef.on("value",this._count,this),this.queryRef=this.desc?this.inRef.limitToLast(this.count):this.inRef.limitToFirst(this.count),this.queryRef.on("child_added",this._add,this),this.queryRef.on("child_removed",this._remove,this),this.queryRef.on("child_moved",this._move,this),this.queryRef.on("child_changed",this._change,this),this.queryRef.on("value",this._value,this),this.queryRef.once("value",this._removeOrphans,this))},r.prototype._add=function(t,e){var n=t.key();i.has(this.keys,n)?i.isEqual(this.keys[n],t.val())||this._change(t):(this.keys[n]=t,this.outRef.$trigger("child_added",t,e))},r.prototype._remove=function(t){var e=t.key();i.has(this.keys,e)&&(this.outRef.$trigger("child_removed",t),delete this.keys[e])},r.prototype._move=function(t,e){var n=t.key();i.has(this.keys,n)&&(this.keys[n]=t,this.outRef.$trigger("child_moved",t,e))},r.prototype._change=function(t){this.keys[t.key()]=t,this.outRef.$trigger("child_changed",t)},r.prototype._value=function(t){this.outRef.$trigger("value",t)},r.prototype._count=function(t){this.endCount=this.start+t.numChildren();var e=this.hasNext();i.each(this.nextListeners,function(t){t[0].call(t[1],e)})},r.prototype._removeOrphans=function(t){i.each(this.keys,function(e,n){t.hasChild(n)||(this.outRef.$trigger("child_removed",e),delete this.keys[n])},this)},e.exports=r},{"../../common":9,"./Offset":4}],4:[function(t,e,n){"use strict";function r(t){this.keys=[],this.field=t.field,this.ref=o(t.ref,t.field),this.max=t.max,this.listeners=[],this.curr=0,this.sub=null,this.isSubscribing=!1,this.lastNotifyValue=h.undef,this._debouncedRecache=a(function(){h.log.debug("Offset._debouncedRecache: recaching keys for offset %d",this.curr),this.keys=[],this._grow(this._listen)},this,100,1e3)}function i(t,e){var n;switch(e){case"$key":n=t.key();break;case"$priority":n=t.getPriority();break;case"$value":n=t.val();break;default:var r=t.val();if(!h.isObject(r))throw new Error("A value of type "+typeof r+'Was found. But we are attempting to order by child field "'+e+"\". Pagination requires all records to be objects or it can't determine an appropriate offset value.");n=r[e]}return{val:n,key:t.key()}}function s(t,e){return e===!1?null:null===e?t:t.startAt(e.val,e.key)}function o(t,e){return"$key"===e?t.orderByKey():"$priority"===e?t.orderByPriority():"$value"===e?t.orderByValue():t.orderByChild(e)}function a(t,e,n,r){function i(){if(u&&(u(),u=null),a&&Date.now()-a>r)c||(c=!0,setTimeout(s,0));else{a||(a=Date.now());var t=setTimeout(s,n);u=function(){clearTimeout(t)}}}function s(){u=null,a=null,c=!1,t.apply(e,h)}function o(){h=Array.prototype.slice.call(arguments,0),i()}var a,u,h,c;if("number"==typeof e&&(r=n,n=e,e=null),"number"!=typeof n)throw new Error("Must provide a valid integer for wait. Try 0 for a default");if("function"!=typeof t)throw new Error("Must provide a valid function to debounce");return r||(r=10*n||100),o.running=function(){return a>0},o}function u(t){var e=t.length;return e?t[e-1]:null}var h=t("../../common");r.prototype.goTo=function(t){t!==this.curr&&(h.log("Offset.goTo: offset changed from %d to %d",this.curr,t),this.curr=t,this.lastNotifyValue=h.undef,this._listen())},r.prototype.observe=function(t,e){this.listeners.push([t,e]);var n=this.getKey(),r=s(this.ref,n);t.call(e,n&&n.val,n&&n.key,r)},r.prototype.getKey=function(t){return arguments.length||(t=this.curr),0===t?null:this.keys.length>t&&this.keys[t]},r.prototype.destroy=function(){this._unsubscribe(),this.curr=0,this.keys=[],this.lastNotifyValue=h.undef,this.isSubscribing=!1},r.prototype._notify=function(){var t=this.getKey();if(!h.isEqual(this.lastNotifyValue,t)){h.log("Offset._notify: key at offset %d is %s",this.curr,t&&t.key),this.lastNotifyValue=t;var e=s(this.ref,t);h.each(this.listeners,function(n){n[0].call(n[1],t&&t.val,t&&t.key,e)})}},r.prototype._recache=function(){this.isSubscribing||this._debouncedRecache()};var c=0;r.prototype._grow=function(t){var e=this,n=e.keys.length;if(e.curr>=n){var r=e.getKey(),s=u(e.keys),o=Math.min(e.curr+(s?2:1)-n,e.max),a=null!==s?e.ref.startAt(s.val,s.key):e.ref;a.limitToFirst(o).once("value",function(n){var a=null!==s;if(n.forEach(function(t){return a?void(a=!1):void e.keys.push(i(t,e.field))}),c++>1e4)throw new Error("Tried to fetch more than 10,000 pages to determine the correct offset. Giving up now. Sorry.");e.curr>=e.keys.length&&n.numChildren()===o?setTimeout(h.bind(e._grow,e,t),0):(c=0,h.log.debug("Offset._grow: Cached %d keys",e.keys.length),t.call(e,!h.isEqual(e.getKey(),r)))})}else t.call(e,!1)},r.prototype._startOffset=function(){return Math.max(0,this.curr-this.max,this.curr-10)},r.prototype._queryRef=function(){var t=this._startOffset(),e=this.ref;if(t>0){var n=this.getKey(t);e=e.startAt(n.val,n.key)}return e.limitToLast(Math.max(this.curr-t,1))},r.prototype._moved=function(t){t.key()===this.getKey()&&this._recache()},r.prototype._unsubscribe=function(){this.sub&&(this.sub.off("child_added",this._recache,this),this.sub.off("child_moved",this._moved,this),this.sub.off("child_removed",this._recache,this),this.sub.off("value",this._doneSubscribing,this),this.sub=null)},r.prototype._subscribe=function(){this._unsubscribe(),this.sub=this._queryRef(),this.isSubscribing=!0,this.sub.on("child_added",this._recache,this),this.sub.on("child_moved",this._moved,this),this.sub.on("child_removed",this._recache,this),this.sub.once("value",this._doneSubscribing,this)},r.prototype._doneSubscribing=function(){this.isSubscribing=!1,this._notify()},r.prototype._monitorEmptyOffset=function(){function t(i){var s=i.numChildren();s>(null===r?0:1)&&(h.log.debug("Offset._monitorEmptyOffset: A value exists now."),n.off("value",t),e._grow())}var e=this,n=e.ref,r=null;this.keys.length&&(r=u(this.keys),n=n.startAt(r.val,r.key)),h.log.debug("Offset._monitorEmptyOffset: No value exists at offset %d, currently %d keys at this path. Watching for a new value.",this.curr,this.keys.length),n.limitToFirst(2).on("value",t)},r.prototype._listen=function(){this._unsubscribe(),this.curr>=this.keys.length?this._grow(function(){this.keys.length>=this.curr?this._subscribe():(this._monitorEmptyOffset(),this._notify())}):this._subscribe()},e.exports=r},{"../../common":9}],5:[function(t,e,n){"use strict";function r(t,e,n){this.currPage=0,this.field=e,this.ref=t,this.pageSize=n.pageSize,this.max=n.maxCacheSize,this.subs=[],this.pageChangeListeners=[],this.pageCountListeners=[],this.cache=new a(t,e,n.maxCacheSize),this.pageCount=-1,this.couldHaveMore=!1,this.cache.observeHasNext(this._countPages,this)}function i(t,e){return 0===t?0:Math.ceil(t/e)}function s(t,e){var n={};if(n.bindFunction=function(t,e){return function(){return t.apply(e,[e])}},n.stateChange=function(t){4==n.request.readyState&&n.callbackFunction(n.request.responseText)},n.getRequest=function(){return window.ActiveXObject?new ActiveXObject("Microsoft.XMLHTTP"):!!window.XMLHttpRequest&&new XMLHttpRequest},n.postBody=arguments[2]||"",n.callbackFunction=e,n.url=t,n.request=n.getRequest(),n.request){var r=n.request;r.onreadystatechange=n.bindFunction(n.stateChange,n),""!==n.postBody?(r.open("POST",t,!0),r.setRequestHeader("X-Requested-With","XMLHttpRequest"),r.setRequestHeader("Content-type","application/x-www-form-urlencoded"),r.setRequestHeader("Connection","close")):r.open("GET",t,!0),r.send(n.postBody)}return n}var o=t("../../common"),a=t("./Cache");r.prototype.next=function(){return this.hasNext()&&(this.currPage++,o.log.debug("Paginate.next: current page is %d",this.currPage),this._pageChange()),this},r.prototype.prev=function(){return this.hasPrev()&&(this.currPage--,o.log.debug("Paginate.prev: current page is %d",this.currPage),this._pageChange()),this},r.prototype.setPage=function(t){t>0&&t<=this.pageCount?(this.currPage=t,o.log.debug("Paginate.setPage: current page is %d",this.currPage),this._pageChange()):o.log.warn("Paginate.setPage: invalid page number %d",t)},r.prototype.hasNext=function(){return this.cache.hasNext()},r.prototype.hasPrev=function(){return this.currPage>1},r.prototype.onPageChange=function(t,e){var n=this.pageChangeListeners,r=[t,e];return n.push(r),t.call(e,this.currPage),function(){o.remove(n,r)}},r.prototype.onPageCount=function(t,e){var n=this.pageCountListeners,r=[t,e];return n.push(r),this.pageCount>-1?t.call(e,this.pageCount,this.couldHaveMore):this._countPages(),function(){o.remove(n,r)}},r.prototype.getCountByDowloadingAllKeys=function(t,e){var n=this;n.downloadingEverything=!0;var r=n.ref.ref().toString();r.match(/\/$/)||(r+="/"),r+=".json?shallow=true",s(r,function(r){var s=0;try{s=o.keys(JSON.parse(r)).length}catch(a){o.log.warn(a)}o.log.debug("Paginate.getCountByDownloadingAllKeys: found %d keys",s),n.downloadingEverything=!1,n.pageCount=i(s,n.pageSize),n.couldHaveMore=!1,n._notifyPageCount(),t&&t.call(e,s)})},r.prototype.destroy=function(){this.cache.destroy(),this.cache=null,this.ref=null,o.each(this.subs,function(t){t()}),this.subs=[],this.pageCountListeners.length=0,this.pageChangeListeners.length=0},r.prototype._countPages=function(){var t=this,e=t.currPage;if(!this.downloadingEverything)if(t.pageCount===-1){var n=t.max,r=t.pageSize,i=this.ref.ref().limitToFirst(n);i.once("value",function(e){t.pageCount===-1&&(t.couldHaveMore=e.numChildren()===n,t.pageCount=Math.ceil(e.numChildren()/r),t._notifyPageCount(),t._countPages())})}else e>=t.pageCount&&(t.pageCount=e,t.couldHaveMore=t.cache.hasNext(),t._notifyPageCount())},r.prototype._pageChange=function(){var t=this.currPage,e=(t-1)*this.pageSize;this.cache.moveTo(e,this.pageSize),this._countPages(),o.each(this.pageChangeListeners,function(e){e[0].call(e[1],t)})},r.prototype._notifyPageCount=function(){var t=this.pageCount,e=this.couldHaveMore;o.each(this.pageCountListeners,function(n){n[0].call(n[1],t,e)})},e.exports=r},{"../../common":9,"./Cache":3}],6:[function(t,e,n){"use strict";function r(t){this._ref=t,this._obs=new a.Observable(["value","child_added","child_removed","child_moved","child_changed"])}function i(t){return function(){var e=a.toArray(arguments),n=this.ref();return n[t].apply(n,e)}}function s(t){return function(){throw new Error(t+" is not supported. This is a read-only reference. You can modify child records after calling .child(), or work with the original by using .ref().")}}function o(t){return function(){throw new Error(t+" is not supported for Paginate and Scroll references. Try calling it on the original reference used to create the instance instead.")}}var a=t("../../common");r.prototype={on:function(t,e,n,r){this._obs.observe(t,e,n,r)},once:function(t,e,n,r){function i(n){s.off(t,i,s),e.call(r,n)}var s=this;this.on(t,i,n,this)},off:function(t,e,n){this._obs.stopObserving(t,e,n)},ref:function(){return this._ref},child:i("child"),parent:i("parent"),root:i("root"),name:i("name"),key:i("key"),toString:i("toString"),auth:i("auth"),unauth:i("unauth"),authWithCustomToken:i("authWithCustomToken"),authAnonymously:i("authAnonymously"),authWithPassword:i("authWithPassword"),authWithOAuthPopup:i("authWithOAuthPopup"),authWithOAuthRedirect:i("authWithOAuthRedirect"),authWithOAuthToken:i("authWithOAuthToken"),getAuth:i("getAuth"),onAuth:i("onAuth"),offAuth:i("offAuth"),createUser:i("createUser"),changePassword:i("changePassword"),removeUser:i("removeUser"),resetPassword:i("resetPassword"),changeEmail:i("changeEmail"),goOffline:i("goOffline"),goOnline:i("goOnline"),set:s("set"),update:s("update"),remove:s("remove"),push:s("push"),setWithPriority:s("setWithPriority"),setPriority:s("setPriority"),transaction:s("transaction"),limit:o("limit"),onDisconnect:o("onDisconnect"),orderByChild:o("orderByChild"),orderByKey:o("orderByKey"),orderByPriority:o("orderByPriority"),limitToFirst:o("limitToFirst"),limitToLast:o("limitToLast"),startAt:o("startAt"),endAt:o("endAt"),equalTo:o("equalTo"),$trigger:function(){this._obs.triggerEvent.apply(this._obs,a.toArray(arguments))}},e.exports=r},{"../../common":9}],7:[function(t,e,n){"use strict";function r(t,e,n,r){this.max=n.windowSize,this.start=0,this.end=0,this.cache=new i(t,e,n.maxCacheSize,r)}var i=t("./Cache");r.prototype.next=function(t){this.hasNext()&&(this.end=this.end+t,this.start=Math.max(0,this.end-this.max,this.start),this.cache.moveTo(this.start,this.end-this.start))},r.prototype.prev=function(t){this.hasPrev()&&(this.start=Math.max(0,this.start-t),this.end=Math.min(this.start+this.max,this.end),this.cache.moveTo(this.start,this.end-this.start))},r.prototype.hasNext=function(){return this.cache.hasNext()},r.prototype.hasPrev=function(){return this.start>0},r.prototype.observeHasNext=function(t,e){return this.cache.observeHasNext(t,e)},r.prototype.destroy=function(){this.cache.destroy(),this.ref=null,this.cache=null},e.exports=r},{"./Cache":3}],8:[function(t,e,n){var r=t("./index.js");n.log=r.log,n.logLevel=r.logLevel,n.escapeEmail=r.escapeEmail},{"./index.js":9}],9:[function(t,e,n){var r=t("./libs/util.js"),i=t("./libs/logger.js");r.extend(n,r,{args:t("./libs/args.js"),log:i,logLevel:i.logLevel,Observable:t("./libs/Observable.js"),Observer:t("./libs/Observer.js"),queue:t("./libs/queue.js")})},{"./libs/Observable.js":10,"./libs/Observer.js":11,"./libs/args.js":12,"./libs/logger.js":13,"./libs/queue.js":14,"./libs/util.js":15}],10:[function(t,e,n){"use strict";function r(t,e){e||(e={}),this._observableProps=a(t,e),this.resetObservers()}function i(t,e){u.each(e,function(e){var n=u.indexOf(t,e);n>=0&&t.splice(n,1)})}function s(t,e){var n=[];return u.each(e,function(e){u.has(t.observers,e)?t.observers[e].length&&(n=n.concat(t.observers[e])):c.warn("Observable.hasObservers: invalid event type %s",e)}),n}function o(t,e,n){u.has(e.oneTimeResults,t)&&n.notify.apply(n,e.oneTimeResults[t])}function a(t,e){return u.extend({onAdd:u.noop,onRemove:u.noop,onEvent:u.noop,oneTimeEvents:[]},e,{eventsMonitored:t,observers:{},oneTimeResults:{}})}var u=t("./util.js"),h=t("./args.js"),c=t("./logger.js"),f=t("./Observer.js");r.prototype={observe:function(t,e,n,r){var i,s=h("observe",arguments,2,4);return t=s.nextFromReq(this._observableProps.eventsMonitored),t&&(e=s.nextReq("function"),n=s.next("function"),r=s.next("object"),i=new f(this,t,e,r,n),this._observableProps.observers[t].push(i),this._observableProps.onAdd(t,i),this.isOneTimeEvent(t)&&o(t,this._observableProps,i)),i},hasObservers:function(t){return this.getObservers(t).length>0},stopObserving:function(t,e,n){var r=h("stopObserving",arguments);t=r.next(["array","string"],this._observableProps.eventsMonitored),e=r.next(["function"]),n=r.next(["object"]),u.each(t,function(t){var r=[],s=this.getObservers(t);u.each(s,function(i){i.matches(t,e,n)&&(i.notifyCancelled(null),r.push(i))},this),i(this._observableProps.observers[t],r),r.length&&this._observableProps.onRemove(t,r)},this)},abortObservers:function(t){var e=[];if(this.hasObservers()){var n=this.getObservers().slice();u.each(n,function(n){n.notifyCancelled(t),e.push(n)},this),this.resetObservers(),e.length&&this._observableProps.onRemove(this.event,e)}},getObservers:function(t){return t=h("getObservers",arguments).listFrom(this._observableProps.eventsMonitored,!0),s(this._observableProps,t)},triggerEvent:function(t){var e=h("triggerEvent",arguments),n=e.listFromWarn(this._observableProps.eventsMonitored,!0),r=e.restAsList();n&&u.each(n,function(e){if(this.isOneTimeEvent(t)){if(u.isArray(this._observableProps.oneTimeResults,t))return void c.warn("One time event was triggered twice, should by definition be triggered once",t);this._observableProps.oneTimeResults[t]=r}var n=this.getObservers(e),i=0;u.each(n,function(t){t.notify.apply(t,r.slice(0)),i++}),this._observableProps.onEvent.apply(null,[e,i].concat(r.slice(0)))},this)},resetObservers:function(){u.each(this._observableProps.eventsMonitored,function(t){this._observableProps.observers[t]=[]},this)},isOneTimeEvent:function(t){return u.contains(this._observableProps.oneTimeEvents,t)},observeOnce:function(t,e,n,r){var i,s=h("observeOnce",arguments,2,4);return t=s.nextFromWarn(this._observableProps.eventsMonitored),t&&(e=s.nextReq("function"),n=s.next("function"),r=s.next("object"),i=new f(this,t,e,r,n,(!0)),this._observableProps.observers[t].push(i),this._observableProps.onAdd(t,i),this.isOneTimeEvent(t)&&o(t,this._observableProps,i)),i}},e.exports=r},{"./Observer.js":11,"./args.js":12,"./logger.js":13,"./util.js":15}],11:[function(t,e,n){"use strict";function r(t,e,n,r,i,s){if("function"!=typeof n)throw new Error("Must provide a valid notifyFn");this.observable=t,this.fn=n,this.event=e,this.cancelFn=i||function(){},this.context=r,this.oneTimeEvent=!!s}var i=t("./util.js");r.prototype={notify:function(){var t=i.toArray(arguments);this.fn.apply(this.context,t),this.oneTimeEvent&&this.observable.stopObserving(this.event,this.fn,this.context)},matches:function(t,e,n){return i.isArray(t)?i.contains(t,function(t){return this.matches(t,e,n)},this):!(t&&t!==this.event||e&&e!==this&&e!==this.fn||n&&n!==this.context)},notifyCancelled:function(t){this.cancelFn.call(this.context,t||null)}},e.exports=r},{"./util.js":15}],12:[function(t,e,n){"use strict";function r(t,e,n,i){if("string"!=typeof t||!u.isObject(e))throw new Error("Args requires at least 2 args: fnName, arguments[, minArgs, maxArgs]");if(!(this instanceof r))return new r(t,e,n,i);this.fnName=t,this.argList=u.toArray(e),this.origArgs=u.toArray(e);var s=this.length=this.argList.length;if(this.pos=-1,u.isUndefined(n)&&(n=0),u.isUndefined(i)&&(i=this.argList.length),s<n||s>i){var o=i>n?u.printf("%d to %d",n,i):n;throw Error(u.printf("%s must be called with %s arguments, but received %d",t,o,s))}}function i(t,e){return e===!0||(u.isArray(e)||(e=[e]),u.contains(e,function(e){switch(e){case"array":return u.isArray(t);case"string":return"string"==typeof t;case"number":return isFinite(parseInt(t,10));case"int":case"integer":return isFinite(parseFloat(t));case"object":return u.isObject(t);case"function":return"function"==typeof t;case"bool":case"boolean":return"boolean"==typeof t;case"boolean-like":return!u.isObject(t);default:throw new Error("Args received an invalid data type: "+e)}}))}function s(t,e,n,r){if(r=u.printf("%s: invalid argument at pos %d, %s (received %s)",e,n,r),t===!0)throw new Error(r);if(!u.has(h,t))throw new Error("The `required` value passed to Args methods must either be true or a method name from 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+return!c.isEqual(t,e[n])});var s=n?c.keys(t):c.keys(t).sort(),o=n?c.keys(e):c.keys(e).sort();return c.isEqual(s,o)&&!c.contains(t,function(t,n){return!c.isEqual(t,e[n])})}return!1},c.bindAll=function(t,e){return c.each(e,function(n,r){"function"==typeof n&&(e[r]=c.bind(n,t))}),e},c.printf=function(){var t=c.toArray(arguments),e=t.shift(),n=e.match(/(%s|%d|%j)/g);return n&&t.length&&c.find(n,function(n){return e=e.replace(n,r(t.shift(),n)),0===t.length}),e},c.mergeToString=function(t){return 0===t.length?null:1===t.length?t[0]:"["+t.join("][")+"]"},c.construct=function(t,e){function n(){return t.apply(this,e)}return n.prototype=t.prototype,new n},c.noop=function(){};var l=[];c.isFirebaseRef=function(t){if(!c.isObject(t))return!1;var e=Object.getPrototypeOf(t);return!(!e||e.constructor!==c.Firebase.prototype.constructor)||("function"==typeof t.ref&&"function"==typeof t.ref().transaction||c.isFirebaseRefWrapper(t))},c.isFirebaseRefWrapper=function(t){return c.contains(l,function(e){return t instanceof e})},c.isQueryRef=function(t){return c.isFirebaseRef(t)&&"function"!=typeof t.transaction},c.registerFirebaseWrapper=function(t){l.push(t)},c._mockFirebaseRef=function(t){c.Firebase=t},c.escapeEmail=function(t){return(t||"").replace(".",",")},c.assertValidEvent=function(t){if(!c.contains(f,t))throw new Error("Event must be one of "+f+", but received "+t)},c.inherits=function(t,e){var n=[t.prototype].concat(c.toArray(arguments).slice(2));return t.prototype=new e,t.prototype.constructor=e,c.each(n,function(e){c.each(e,function(e,n){t.prototype[n]=e})}),t.prototype._super=function(){e.apply(this,arguments)},t},c.deepCopy=function(t){if(!c.isObject(t))return t;var e=c.isArrayLike(t)?[]:{};return c.each(t,function(t,n){e[n]=c.deepCopy(t)}),e},c.pick=function(t,e){if(!c.isObject(t))return{};var n=c.isArrayLike(t)?[]:{};return c.each(e,function(e){n[e]=t[e]}),n},c.eachByPath=function(t,e,n,r){var i={};c.each(e,function(e,n){var r=t.pathFor(n),s=t.getField(n),o=s?s.id:n;c.has(i,r.name())||(i[r.name()]={path:r,data:{}}),i[r.name()].data[o]=e}),c.each(i,function(t){n.call(r,t.path,t.data)})}}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{firebase:"firebase"}],"firebase-util":[function(t,e,n){"use strict";var r=t("./common/index.js");r.extend(n,t("./common/exports.js"),t("./Paginate/exports.js")),"undefined"!=typeof window&&(window.hasOwnProperty("Firebase")?window.Firebase.util=r:console.warn("Firebase not found on the global window instance. Cannot add Firebase.util namespace."))},{"./Paginate/exports.js":2,"./common/exports.js":8,"./common/index.js":9}]},{},[1]);
\ No newline at end of file
diff --git a/dist/firebase-util.js b/dist/firebase-util.js
new file mode 100644
index 0000000..7d5bf4b
--- /dev/null
+++ b/dist/firebase-util.js
@@ -0,0 +1,4799 @@
+/*!
+ * Firebase-util:  A set of experimental power tools for Firebase.
+ *
+ * Version: 0.2.6
+ * URL: https://github.com/firebase/firebase-util
+ * Date: 2016-11-21T15:10:56.452Z
+ * License: MIT http://firebase.mit-license.org/
+ */
+
+require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
+(function (global){
+// place fbutil onto Firebase.util namespace
+// if we are in the browser and Firebase exists
+if( global.Firebase ) {
+  global.Firebase.util = require('firebase-util');
+}
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"firebase-util":undefined}],2:[function(require,module,exports){
+
+exports.NormalizedCollection = require('./libs/NormalizedCollection.js');
+},{"./libs/NormalizedCollection.js":6}],3:[function(require,module,exports){
+'use strict';
+
+var util = require('../../common/');
+
+/**
+ * A Record represents a set of merged data. The hierarchy of a normalized Collection
+ * can be traversed as normal using parent() and child() calls:
+ *    - RecordSet: The root of a normalized collection; a set of merged Firebase paths
+ *    - Record: A child of RecordSet obtained by calling .child(recordId)
+ *    - RecordField: A child of Record or RecordField which represents a wrapped Firebase path (no longer normalized)
+ *
+ * We wrap all of these levels, including the RecordField's, so that the
+ * parent() and child() calls work as expected and return the normalized chain instead
+ * of reverting to the underlying Firebase instances.
+ *
+ * AbstractRecord provides common functionality around observables, event handling, and field maps
+ * used by all three implementations.
+ *
+ * @param fieldMap the field map applied to Record objects
+ * @param {String} name
+ * @param {String} url
+ * @constructor
+ */
+function AbstractRecord(fieldMap, name, url) {
+  var self = this;
+  self._ref = null;
+  self._map = fieldMap;
+  self._name = name;
+  self._url = url;
+  self.lastMergedValue = util.undef; // starts undefined since first value may be null
+  self._obs = new util.Observable(
+    ['child_added', 'child_removed', 'child_changed', 'child_moved', 'value'],
+    {
+      onAdd: function(event) {
+        var count = self._obs.getObservers(event).length;
+        if( count === 1 ) {
+          self._start(event, self._obs.getObservers().length);
+        }
+      },
+      onRemove: function(event) {
+        var count = self._obs.getObservers(event).length;
+        if( count === 0 ) {
+          self._stop(event, self._obs.getObservers().length);
+        }
+      }
+    }
+  );
+}
+
+AbstractRecord.prototype = {
+  /**
+   * Called internally by AbstractRecord whenever the first listener
+   * is attached for a given event. Also includes a count of the
+   * total number of listeners
+   *
+   * @param {string} type
+   * @param {int} totalListeners
+   * @abstract
+   */
+  _start: abstract('_start'),
+
+  /**
+   * Called internally by AbstractRecord whenever
+   * the last listener is detached for a given type. Also provides
+   * the total listener count
+   *
+   * @param {string} type
+   * @param {int} totalListeners
+   * @abstract
+   */
+  _stop:  abstract('_stop'),
+
+  /**
+   * Should return true if the snapshots provided contain the child key and if it
+   * exists in the fields for this record type.
+   *
+   * @param {Array} snapshots
+   * @param {string} key
+   * @abstract
+   */
+  hasChild: abstract('hasChild'),
+
+  /**
+   * Given a list of snapshots to iterate, returns the valid keys
+   * which exist in both the snapshots and the field map, in the
+   * order they should be iterated.
+   *
+   * Calls iterator with a {string|number} key for the next field to
+   * iterate only.
+   *
+   * If iterator returns true, this method should abort and return true,
+   * otherwise it should return false (same as Snapshot.forEach).
+   *
+   * @param {Array} snaps
+   * @param {function} iterator
+   * @param {object} [context]
+   * @return {boolean} true if aborted
+   * @abstract
+   */
+  forEachKey: abstract('forEach'),
+
+  /**
+   * When .child() is called on a Snapshot, this will reconcile
+   * the correct refs and data for each child and return an array
+   * containing the child snapshots for the specified key. For
+   * a RecordSet, this should return children for all the fields
+   * in the field map. For a Record, this should return a child
+   * from the correct snapshot, or the first if the child is not
+   * in the map.
+   *
+   * @param {Array} snaps
+   * @param {string} key
+   * @abstract
+   */
+  getChildSnaps: abstract('getChildSnaps'),
+
+  /**
+   * This should take all the data from a set of snapshots and
+   * merge it together appropriately. For a RecordSet, this should
+   * return records ordered by the first reference. For a Record,
+   * this should return the fields in the field map.
+   *
+   * @param {Array} snaps
+   * @param {boolean} isExport
+   * @abstract
+   */
+  mergeData: abstract('mergeData'),
+
+  /**
+   * Returns the specific implementing class for this instance.
+   *
+   * @returns {Function}
+   */
+  getClass: abstract('getClass'),
+
+  /**
+   * Saves data back to the correct paths
+   *
+   * @param data
+   * @param {Object} props an object with callback[, context][, isUpdate]
+   */
+  saveData: abstract('saveData'),
+
+  /**
+   * Returns the priority for a given set of snapshots
+   * @param {Array} snapshots
+   * @return {int|string}
+   */
+  getPriority: abstract('getPriority'),
+
+  /**
+   * This returns the appropriate AbstractRecord type in the chain. Note that references
+   * created here will not be usable until setRef() is called, so this should only be used
+   * for passing into a Query. Use .child() for everything else.
+   *
+   * @param {String} childName
+   * @return {AbstractRecord}
+   */
+  makeChild: abstract('makeChild'),
+
+  /**
+   * @param {string} event
+   * @param {function} callback
+   * @param {function} [cancel]
+   * @param {object} [context]
+   */
+  watch: function(event, callback, cancel, context) {
+    this._obs.observe(event, callback, cancel, context);
+  },
+
+  /**
+   * @param {string} event
+   * @param {function} [callback]
+   * @param {object} [context]
+   */
+  unwatch: function(event, callback, context) {
+    this._obs.stopObserving(event, callback, context);
+  },
+
+  getFieldMap: function() {
+    return this._map;
+  },
+
+  getPathManager: function() {
+    return this._map.getPathManager();
+  },
+
+  setRef: function(ref) {
+    this._ref = ref;
+  },
+
+  getRef: function() {
+    return this._ref;
+  },
+
+  /**
+   * @param {String} key
+   * @returns {Record}
+   */
+  child: function(key) {
+    return this.getRef().ref().child(key).$getRecord();
+  },
+
+  /**
+   * Returns an appropriate path name or merged set of names for this record type.
+   * @return {String}
+   */
+  getName: function() {
+    return this._name;
+  },
+
+  /**
+   * Returns a Firebase URL or a merged set of URLs for the Record
+   * @return {String}
+   */
+  getUrl: function() {
+    return this._url;
+  },
+
+  trigger: function(snapshotFactory) {
+    util.log.debug('AbstractRecord._trigger: %s', snapshotFactory.toString());
+    this._obs.triggerEvent(snapshotFactory.event, snapshotFactory.create(this.getRef()));
+  },
+
+  /**
+   * @param {object} error
+   */
+  _cancel: function(error) {
+    util.error(error);
+    this._obs.abortObservers(error);
+  }
+};
+
+function abstract(method) {
+  return function() {
+    throw new Error('Classes implementing AbstractRecord must declare ' + method);
+  };
+}
+
+module.exports = AbstractRecord;
+},{"../../common/":25}],4:[function(require,module,exports){
+'use strict';
+
+var util = require('../../common');
+var PathManager = require('./PathManager');
+
+function FieldMap(pathManager) {
+  this.fields = {};
+  this.length = 0;
+  this.pathMgr = pathManager;
+}
+
+FieldMap.prototype = {
+  add: function(fieldProps) {
+    var f = new Field(parseProps(fieldProps, this.pathMgr));
+    if( this.fields.hasOwnProperty(f.alias) ) {
+      throw new Error('Duplicate field alias ' + f.alias + '(' + f.key + ')');
+    }
+    if( f.path === null ) {
+      throw new Error('Invalid path specified for field ' + f.key + '; it was not in the paths ' +
+        'provided, which are : ' + this.pathMgr.getPathNames().join(','));
+    }
+    var dep = f.path.getDependency();
+    if(dep !== null && getDepField(this.fields, dep) === null) {
+      throw new Error('Dynamic paths must reference a field declared in the map. Please add ' +
+        FieldMap.key(dep.path, dep.field) + ' to the select() criteria before using it in a ' +
+        'dynamic field');
+    }
+    this.fields[f.alias] = f;
+    this.length++;
+  },
+
+  forEach: function(callback, context) {
+    return util.find(this.fields, callback, context) !== util.undef;
+  },
+
+  getField: function(fieldName) {
+    return this.fields[fieldName]||null;
+  },
+
+  getPath: function(pathName) {
+    return this.getPathManager().getPath(pathName);
+  },
+
+  getPathManager: function() {
+    return this.pathMgr;
+  },
+
+  pathFor: function(fieldName) {
+    var f = this.getField(fieldName);
+    return f? f.path : this.pathMgr.first();
+  },
+
+  fieldsFor: function(pathName) {
+    return util.filter(util.toArray(this.fields), function(f) {
+      return f.pathName === pathName;
+    });
+  },
+
+  aliasFor: function(url) {
+    var f = util.find(this.fields, function(f) {
+      return f.url === url;
+    }, this);
+    return f? f.alias : null;
+  },
+
+  /**
+   * Pulls data out of a snapshot aliased by the field map. Only keys in the field map
+   * will be returned. Always returns an object. Does not return a priority at the root
+   * level but will return priorities for all children. If the snapshot contains a primitive,
+   * an empty object will be returned.
+   *
+   * This is not intended to provide finalized values but instead to provide an object representation
+   * of each snapshot useful for merging snapshot data into a finalized value (see Record.mergeData)
+   *
+   * @param {object} snapshot a Firebase snapshot
+   * @param {boolean} [isExport]
+   * @returns {object}
+   */
+  extractData: function(snapshot, isExport) {
+    var out = {};
+    var pathName = this.pathMgr.getPathName(snapshot.ref().toString());
+    if( pathName === null && snapshot.ref().parent() !== null ) {
+      var parentPath = this.pathMgr.getPathFor(snapshot.ref().parent().toString());
+      if( parentPath && parentPath.hasDependency() ) {
+        pathName = parentPath.name();
+      }
+    }
+    var fx = isExport? 'exportVal' : 'val';
+    util.each(this.fieldsFor(pathName), function(f) {
+      switch(f.id) {
+        case '$key':
+          putIn(out, f.alias, snapshot.key());
+          break;
+        case '$value':
+          putIn(out, f.alias, snapshot[fx]());
+          break;
+        default:
+          if( snapshot.hasChild(f.id) ) {
+            putIn(out, f.alias, snapshot.child(f.id)[fx]());
+          }
+      }
+    });
+    return out;
+  },
+
+  /**
+   * Given an array of snapshots and an aliased fieldName, this will return the appropriate
+   * snapshot containing the corresponding field. If no snapshot matches a field in this map,
+   * it will return null.
+   *
+   * @param {Array} snaps a list of Firebase snapshots
+   * @param {String} fieldName
+   * @returns {object|null}
+   */
+  snapFor: function(snaps, fieldName) {
+    var url;
+    var path = this.pathFor(fieldName);
+    if( !path ) { return null; }
+    var dep = path.getDependency();
+    if( dep !== null ) {
+      var depField = getDepField(this.fields, dep);
+      var depSnap = this.snapFor(snaps, depField.alias);
+      if( depSnap ) {
+        if (dep.field === '$key') {
+          url = path.child(depSnap.key()).url();
+        }
+        else if (dep.field === '$value') {
+          url = path.child(depSnap.val()).url();
+        }
+        else {
+          url = path.child(depSnap.child(dep.field).val()).url();
+        }
+      }
+    }
+    else {
+      url = path.url();
+    }
+    if( url ) {
+      return util.find(snaps, function (snap) {
+          return snap.ref().toString() === url;
+        }) || null;
+    }
+    else {
+      return null;
+    }
+  },
+
+  /**
+   * Since data can be nested under child keys, this method returns a map of fields->data which
+   * is flattened for each key.
+   *
+   * @param {object} data
+   * @returns {object} an array containing [ [Path, Object]... ] where each object is a key/value store
+   */
+  denest: function(data) {
+    var out = {};
+    util.each(this.getPathManager().getPaths(), function(p) {
+      out[p.name()] = { path: p, data: {} };
+    });
+
+    this.forEach(function(field) {
+      var val = getOut(data, field.alias);
+      if( val !== util.undef ) {
+        switch(field.id) {
+          case '$value':
+            out[field.pathName].data = val;
+            break;
+          case '$key':
+            // do nothing
+            break;
+          default:
+            out[field.pathName].data[field.id] = val;
+        }
+      }
+    });
+    return out;
+  },
+
+  idFor: function(fieldName) {
+    var f = this.getField(fieldName);
+    if( !f ) { return fieldName; }
+    return f.id;
+  }
+};
+
+FieldMap.key = function(path, field) {
+  if( typeof path !== 'string' ) {
+    path = path.name();
+  }
+  return path + '.' + field;
+};
+
+FieldMap.fieldMap = function(map, fieldName) {
+  var childPath;
+  var field = map.getField(fieldName);
+  if( field ) {
+    childPath = field.path;
+    if( field.id !== '$value' ) {
+      childPath = childPath.child(field.id);
+    }
+  }
+  else {
+    childPath = map.pathFor(fieldName).child(fieldName);
+  }
+  var pm = new PathManager([childPath]);
+  var fm = new FieldMap(pm);
+  fm.add({key: FieldMap.key(childPath, '$value'), alias: fieldName});
+  return fm;
+};
+
+/**
+ * Fetch a list of paths suitable for use in a Record.
+ *
+ * @param {FieldMap} map to be copied
+ * @param {string} recordId the push id for the record
+ * @returns {FieldMap} a copy of the field map with paths ajusted down to the child node
+ */
+FieldMap.recordMap = function(map, recordId) {
+  var mgr = map.getPathManager();
+  var paths = util.map(mgr.getPaths(), function(p) {
+    return p.normChild(recordId);
+  });
+  var childMap = new FieldMap(new PathManager(paths));
+  map.forEach(function(field) {
+    childMap.add({key: field.key, alias: field.alias});
+  });
+  return childMap;
+};
+
+function getDepField(fields, dep) {
+  return util.find(fields, function(field) {
+    return field.pathName === dep.path && field.id === dep.field;
+  }) || null;
+}
+
+function Field(props) {
+  // these properties are considered public and accessed directly by other classes
+  this.path = props.path;
+  this.id = props.id;
+  this.key = props.key;
+  this.alias = props.alias;
+  this.url = props.url;
+  this.pathName = props.pathName;
+  this.isNested = props.alias.indexOf('.') >= 0;
+}
+
+function parseProps(propsRaw, pathMgr) {
+  if( propsRaw instanceof Field ) {
+    return util.pick(propsRaw, ['path', 'id', 'key', 'alias', 'pathName', 'url']);
+  }
+  else if( typeof(propsRaw) === 'string' ) {
+    propsRaw = { key: propsRaw };
+  }
+  var parts = propsRaw.key.split('.');
+  var path = pathMgr.getPath(parts[0]);
+  return {
+    pathName: parts[0],
+    id: parts[1],
+    key: propsRaw.key,
+    alias: propsRaw.alias || parts[1],
+    path: path,
+    //todo-dynamic-keys this isn't correct for dynamic fields :(
+    //todo-dynamic-keys and probably not for $value and $key either
+    url: path? path.url() + '/' + parts[1] : null
+  };
+}
+
+function putIn(data, alias, val) {
+  if( val === null ) { return; }
+  if( alias.indexOf('.') > 0 ) {
+    var parts = alias.split('.').reverse(), p;
+    while(parts.length > 1 && (p = parts.pop())) {
+      data = data[p] = util.has(data, p)? data[p] : {};
+    }
+    alias = parts.pop();
+  }
+  data[alias] = val;
+}
+
+function getOut(data, alias) {
+  var key = alias;
+  if( !util.isObject(data) ) { return util.undef; }
+  var val = data[alias];
+  if( alias.indexOf('.') > 0 ) {
+    var parts = alias.split('.').reverse();
+    val = data;
+    while(parts.length) {
+      key = parts.pop();
+      val = util.isObject(val) && val.hasOwnProperty(key)? val[key] : util.undef;
+    }
+  }
+  return val;
+}
+
+module.exports = FieldMap;
+},{"../../common":25,"./PathManager":10}],5:[function(require,module,exports){
+'use strict';
+
+var util = require('../../common');
+
+function Filter() {
+  this.criteria = [];
+  util.each(arguments, this.add, this);
+}
+
+Filter.prototype = {
+  add: function(fn) {
+    this.criteria.push(
+      new Condition(fn)
+    );
+  },
+  test: function(recordData, key, priority) {
+    return util.contains(this.criteria, function(cond) {
+      return !cond.test(recordData, key, priority);
+    }) === false;
+  }
+};
+
+function Condition(fn) {
+  this.match = fn;
+}
+
+Condition.prototype.test = function(data, key, priority) {
+  return this.match(data, key, priority) === true;
+};
+
+module.exports = Filter;
+},{"../../common":25}],6:[function(require,module,exports){
+'use strict';
+
+var util          = require('../../common');
+var PathManager   = require('./PathManager');
+var Filter        = require('./Filter');
+var FieldMap      = require('./FieldMap');
+var NormalizedRef = require('./NormalizedRef');
+var RecordSet     = require('./RecordSet');
+
+/**
+ * @param {...object} path
+ * @constructor
+ */
+function NormalizedCollection(path) { //jshint unused:vars
+  assertPaths(arguments);
+  this.pathMgr = new PathManager(util.toArray(arguments));
+  this.map = new FieldMap(this.pathMgr);
+  this.filters = new Filter();
+  this.finalized = false;
+}
+
+NormalizedCollection.prototype = {
+  select: function(fieldName) { //jshint unused:vars
+    assertNotFinalized(this, 'select');
+    var args = util.args('NormalizedCollection.select', arguments, 1);
+    util.each(args.restAsList(0, ['string', 'object']), function(f) {
+      assertValidField(f);
+      this.map.add(f);
+    }, this);
+    return this;
+  },
+
+  filter: function(matchFn) { //jshint unused:vars
+    assertNotFinalized(this, 'filter');
+    var args = util.args('NormalizedCollection.filter', arguments, 1, 1);
+    this.filters.add(
+      args.nextReq('function')
+    );
+    return this;
+  },
+
+  ref: function() {
+    if( !this.map.length ) {
+      throw new Error('Must call select() with at least one field' +
+        ' before creating a ref');
+    }
+    this.finalized = true;
+    if( util.log.isInfoEnabled() ) {
+      util.log.info('NormalizedRef created using %s', buildDebugString(this));
+    }
+    var recordSet = new RecordSet(this.map, this.filters);
+    return new NormalizedRef(recordSet);
+  }
+};
+
+function assertPaths(args) {
+  if( args.length < 1 ) {
+    throw new Error('Must provide at least one path definition');
+  }
+  function notValidRef(p) {
+    if( util.isArray(p) ) {
+      p = p[0];
+    }
+    return !util.isFirebaseRef(p);
+  }
+  if( util.contains(args, notValidRef) ) {
+    throw new Error('Each argument to the NormalizedCollection constructor must be a ' +
+      'valid Firebase reference or an Array containing a Firebase ref as the first argument');
+  }
+}
+
+function assertNotFinalized(self, m) {
+  if( self.finalized ) {
+    throw new Error('Cannot call ' + m + '() after ref() has been invoked');
+  }
+}
+
+function buildDebugString(nc) {
+  var paths = [];
+  var selects = [];
+  var filter = '';
+
+  util.each(nc.pathMgr.getPaths(), function(p) {
+    var dep = p.getDependency();
+    paths.push(
+      util.printf('\t"%s%s"%s',
+        p.url(),
+        p.id() === p.name()? '' : ' as ' + p.name(),
+        dep? '-> ' + dep.path + '.' + dep.field : ''
+      )
+    );
+  });
+
+  nc.map.forEach(function(f) {
+    selects.push(util.printf('"%s%s"', f.key, f.alias === f.id? '' : ' as ' + f.alias));
+    if( selects.length % 5 === 0 ) {
+      selects.push('\n');
+    }
+  });
+
+  if(nc.filters.criteria.length > 0) {
+    filter = util.printf('<%s filters applied>', nc.filters.criteria.length);
+  }
+
+  return util.printf('NormalizedCollection(\n%s\n).select(%s)%s.ref()', paths.join('\n'), selects.join(', '), filter);
+}
+
+function assertValidField(f) {
+  var k;
+  if( typeof f === 'string' ) {
+    k = f;
+  }
+  else {
+    k = util.has(f, 'key')? f.key : util.undef;
+  }
+  if( typeof k !== 'string' || k.indexOf('.') <= 0 ) {
+    throw new Error('Each field passed to NormalizedCollection.select() must either be a string ' +
+    'in the format "pathAlias.fieldId", or an object in the format ' +
+    '{key: "pathAlias.fieldId", alias: "any_name_for_field"}, but I received ' + JSON.stringify(f));
+  }
+}
+
+module.exports = NormalizedCollection;
+},{"../../common":25,"./FieldMap":4,"./Filter":5,"./NormalizedRef":7,"./PathManager":10,"./RecordSet":14}],7:[function(require,module,exports){
+'use strict';
+
+var util      = require('../../common');
+var Query     = require('./Query');
+
+function NormalizedRef(record, parent) {
+  this._super(this, record);
+  this._parent = parent||null;
+  this._key = record.getName();
+  this._toString = record.getUrl();
+}
+
+util.inherits(NormalizedRef, Query, {
+  'child': function(fieldName) {
+    var parts = fieldName.split('/').reverse(); // pop is faster than shift
+    var parent = this;
+    var ref = this;
+    while(parts.length) {
+      var key = parts.pop();
+      ref = new NormalizedRef(ref.$getRecord().makeChild(key), parent);
+      parent = ref;
+    }
+    return ref;
+  },
+
+  'parent': function() {
+    return this._parent;
+  },
+
+  'root': function() {
+    var p = this;
+    while(p.parent() !== null) {
+      p = p.parent();
+    }
+    return p;
+  },
+
+  /** @deprecated */
+  'name': function() {
+    console.warn('The name() function has been deprecated. Use key() instead.');
+    return this.key();
+  },
+
+  'key': function() {
+    return this._key;
+  },
+
+  'toString': function() {
+    return this._toString;
+  },
+
+  //todo have set, update, push, remove attempt to revert any partial commits
+  //todo by running a transaction and, if the value is still the "new" partial
+  //todo value, then revert it to the old complete value
+
+  'set': function(data, callback, context) {
+    this.$getRecord().saveData(data, {callback: callback, context: context, isUpdate: false});
+  },
+
+  'update': function(data, callback, context) {
+    this.$getRecord().saveData(data, {callback: callback, context: context, isUpdate: true});
+  },
+
+  'remove': function(callback, context) {
+    this.$getRecord().saveData(null, {callback: callback, context: context, isUpdate: false});
+  },
+
+  'push': function(data, callback, context) { // jshint unused:false
+    var uid = this.$getMaster().push().key();
+    var child = this.child(uid);
+    if( arguments.length ) {
+      child.set.apply(child, arguments);
+    }
+    return child;
+  },
+
+  'setWithPriority': function(data, priority, callback, context) {
+    this.$getRecord().saveData(data, {
+      callback: callback, context: context, isUpdate: false, priority: priority
+    });
+  },
+
+  'setPriority': function(priority, callback, context) {
+    this.$getMaster().setPriority(priority, callback, context);
+  },
+
+  /****************************
+   * WRAPPER FUNCTIONS
+   ****************************/
+  'auth': wrapMaster('auth'),
+  'unauth': wrapMaster('unauth'),
+  'authWithCustomToken': wrapMaster('authWithCustomToken'),
+  'authAnonymously': wrapMaster('authAnonymously'),
+  'authWithPassword': wrapMaster('authWithPassword'),
+  'authWithOAuthPopup': wrapMaster('authWithOAuthPopup'),
+  'authWithOAuthRedirect': wrapMaster('authWithOAuthRedirect'),
+  'authWithOAuthToken': wrapMaster('authWithOAuthToken'),
+  'getAuth': wrapMaster('getAuth'),
+  'onAuth': wrapMaster('onAuth'),
+  'offAuth': wrapMaster('offAuth'),
+  'createUser': wrapMaster('createUser'),
+  'changePassword': wrapMaster('changePassword'),
+  'removeUser': wrapMaster('removeUser'),
+  'resetPassword': wrapMaster('resetPassword'),
+  'changeEmail': wrapMaster('changeEmail'),
+
+  'goOffline': wrapAll('goOffline'),
+  'goOnline': wrapAll('goOnline'),
+
+  /****************************
+   * UNSUPPORTED FUNCTIONS
+   ***************************/
+  'transaction': notSupported('transaction'), //todo use field map to pick fields and apply to each
+  'onDisconnect': notSupported('onDisconnect') //todo use field map to pick fields and apply to each
+});
+
+function wrapAll(method) {
+  return function() {
+    var args = util.toArray(arguments);
+    util.each(this.$getPaths(), function(p) {
+      var ref = p.ref();
+      ref[method].apply(ref, args);
+    });
+  };
+}
+
+function wrapMaster(method) {
+  return function() {
+    var args = util.toArray(arguments);
+    var ref = this.$getMaster();
+    return ref[method].apply(ref, args);
+  };
+}
+
+function notSupported(method) {
+  return function() {
+    throw new Error(method + ' is not supported for NormalizedCollection references. ' +
+      'Try calling it on the original reference used to create the NormalizedCollection instead.');
+  };
+}
+
+module.exports = NormalizedRef;
+},{"../../common":25,"./Query":11}],8:[function(require,module,exports){
+'use strict';
+
+var util = require('../../common');
+
+function NormalizedSnapshot(ref, snaps) {
+  this._ref = ref;
+  this._rec = ref.$getRecord();
+  if( !util.isArray(snaps) ) {
+    throw new Error('Must provide an array of snapshots to merge');
+  }
+  this._pri = this._rec.getPriority(snaps);
+  this._snaps = snaps;
+}
+
+NormalizedSnapshot.prototype = {
+  val: function() {
+    if( !this._snaps.length ) {
+      return null;
+    }
+    return this._rec.mergeData(this._snaps, false);
+  },
+
+  child: function(key) {
+    var snap;
+    // keys may contain / to separate nested child paths
+    // so make a list of child keys (we reverse it once
+    // as this is faster than unshift() on each iteration)
+    var childParts = key.split('/').reverse();
+    // grab the first key and get the child snapshot
+    var firstChildName = childParts.pop();
+    snap = new NormalizedSnapshot(
+      this._ref.child(firstChildName),
+      this._rec.getChildSnaps(this._snaps, firstChildName)
+    );
+    // iterate any nested keys and keep calling child on them
+    while(childParts.length) {
+      snap = snap.child(childParts.pop());
+    }
+    return snap;
+  },
+
+  forEach: function(cb, context) {
+    return this._rec.forEachKey(this._snaps, function(childId, childAlias) {
+      if( childId === '$value' || childId === '$key' ) { return false; }
+      return cb.call(context, this.child(childAlias));
+    }, this);
+  },
+
+  hasChild: function(key) {
+    //todo optimize and/or memoize?
+    var parts = key.split('/').reverse();
+    var res = parts.length > 0;
+    var nextRef = this._ref;
+    var nsnap = this;
+    while(res && parts.length) {
+      var nextKey = parts.pop();
+      res = nextRef.$getRecord().hasChild(nsnap._snaps, nextKey);
+      if( res && parts.length ) {
+        nextRef = nextRef.child(nextKey);
+        nsnap = nsnap.child(nextKey);
+      }
+    }
+    return res;
+  },
+
+  /**
+   * Returns true if this snapshot has any child data. Does not return true for $key or $value
+   * fields.
+   *
+   * @returns {boolean}
+   */
+  hasChildren: function() {
+    // if there are any keys to iterate, and that key is not $key or $value
+    // then we have children
+    return this._rec.forEachKey(this._snaps, function(id) {
+      return id !== '$key' && id !== '$value';
+    });
+  },
+
+  /** @deprecated */
+  name: function() {
+    console.warn('name() has been deprecated. Use key() instead.');
+    return this.key();
+  },
+
+  key: function() {
+    return this._rec.getName();
+  },
+
+  numChildren: function() {
+    //todo-bug does not account for nested aliases (they will change the count here)
+    var ct = 0;
+    this._rec.forEachKey(this._snaps, function(id) {
+      if( id !== '$key' && id !== '$value' ) { ct++; }
+    });
+    return ct;
+  },
+
+  ref: function() { return this._ref.ref(); },
+
+  getPriority: function() { return this._pri; },
+
+  exportVal: function() {
+    return this._rec.mergeData(this._snaps, true);
+  },
+
+  exists: function() {
+    return this.val() !== null;
+  }
+};
+
+module.exports = NormalizedSnapshot;
+},{"../../common":25}],9:[function(require,module,exports){
+'use strict';
+
+var util = require('../../common');
+
+function Path(pathProps, parent) {
+  var props = parseProps(pathProps);
+  this._ref = props.ref;
+  this._alias = props.alias;
+  this._dep = props.dep;
+  this._parent = parent || null;
+}
+
+Path.prototype = {
+  ref: function() { return this._ref; },
+  reff: function() { return this.ref().ref(); },
+  child: function(key) {
+    return new Path(this.reff().child(key), this);
+  },
+  normChild: function(key) {
+    var dep = this.getDependency();
+    if( dep !== null ) {
+      return new Path([this.reff(), this.name(), dep.path+'.'+dep.field], this);
+    }
+    else {
+      return new Path([this.reff().child(key), this.name()], this);
+    }
+  },
+  hasDependency: function() {
+    return this._dep !== null;
+  },
+  getDependency: function() {
+    return this._dep;
+  },
+  url: function() { return this.reff().toString(); },
+  name: function() { return this._alias; },
+  id: function() { return this.reff().key(); },
+  parent: function() { return this._parent; },
+  clone: function() {
+    return new Path([this._ref, this._alias, this._dep], this._parent);
+  }
+};
+
+function parseProps(props) {
+  var ref, alias, dep = null;
+  if( util.isArray(props) ) {
+    ref = props[0];
+    alias = props[1];
+    dep = props[2];
+  }
+  else if( util.isFunction(props.ref) ) {
+    ref = props.ref();
+  }
+  else {
+    ref = props;
+  }
+  return {
+    ref: ref, alias: alias||ref.key(), dep: parseDep(dep)
+  };
+}
+
+function parseDep(dep) {
+  if(util.isObject(dep) ) {
+    return dep;
+  }
+  else if( dep ) {
+    var parts = dep.split('.');
+    return { path: parts[0], field: parts[1] };
+  }
+  return null;
+}
+
+module.exports = Path;
+},{"../../common":25}],10:[function(require,module,exports){
+'use strict';
+
+var Path = require('./Path');
+var util = require('../../common');
+
+function PathManager(paths) {
+  this.paths = [];
+  this.pathsByUrl = {};
+  this.deps = {};
+  this.pathNames = [];
+  util.each(paths, this.add, this);
+}
+
+PathManager.prototype = {
+  add: function(pathProps) {
+    var path = pathProps instanceof Path? pathProps.clone() : new Path(pathProps);
+    if( !this.paths.length && path.hasDependency() ) {
+      throw new Error('The master path (i.e. the first) may not declare a dependency.' +
+        ' Perhaps you have put the wrong path first in the list?');
+    }
+    if( util.has(this.pathsByUrl, path.url()) ) {
+      throw new Error('Duplicate path: ' + path.url());
+    }
+    if( util.contains(this.pathNames, path.name()) ) {
+      throw new Error('Duplicate path name. The .key() value for each path must be unique, or you ' +
+          'can give each a path an alias by using [firebaseRef, alias] in the constructor. The aliases ' +
+          'must also be unique.');
+    }
+    this._map(path);
+    this.paths.push(path);
+    this.pathsByUrl[path.url()] = path.name();
+    this.pathNames.push(path.name());
+  },
+
+  count: function() {
+    return this.paths.length;
+  },
+
+  first: function() {
+    return this.paths[0];
+  },
+
+  getPath: function(pathName) {
+    return util.find(this.paths, function(p) {
+      return p.name() === pathName;
+    })||null;
+  },
+
+  getPathFor: function(url) {
+    var n = this.getPathName(url);
+    return n? this.getPath(n) : null;
+  },
+
+  getPaths: function() {
+    return this.paths.slice();
+  },
+
+  getPathName: function(url) {
+    return this.pathsByUrl[url] || null;
+  },
+
+  getPathNames: function() {
+    return this.pathNames.slice();
+  },
+
+  getUrls: function() {
+    return util.keys(this.pathsByUrl);
+  },
+
+  //todo remove?
+  getDependencyGraph: function() {
+    return util.extend(true, this.deps);
+  },
+
+  _map: function(path) {
+    var first = this.first();
+    var dep = path.getDependency();
+    if( !dep && first ) {
+      dep = { path: first.name(), field: '$key' };
+    }
+    if( dep ) {
+      this.deps[path.name()] = dep;
+      this._assertNotCircularDep(path.name());
+    }
+  },
+
+  _assertNotCircularDep: function(pathName) {
+    var map = [pathName], dep = this.deps[pathName];
+    while(util.isDefined(dep)) {
+      var p = dep.path;
+      if(util.contains(map, p)) {
+        map.push(p); // adds it into the error message chain
+        throw new Error('Circular dependencies in paths: ' + depChain(map, this.deps));
+      }
+      map.push(p);
+      dep = util.val(this.deps, p);
+    }
+  }
+};
+
+function depChain(map, deps) {
+  return util.map(map, function(p) {
+    return deps[p].path + '.' + deps[p].field;
+  }).join(' >> ');
+}
+
+module.exports = PathManager;
+},{"../../common":25,"./Path":9}],11:[function(require,module,exports){
+'use strict';
+
+var util = require('../../common');
+var Transmogrifier = require('./Transmogrifier');
+
+function Query(ref, record) {
+  var self = this;
+  self._ref = ref;
+  self._rec = record;
+  // necessary because util.inherit() can only call classes with an empty constructor
+  // so we can't depend on the params existing for that call
+  if( record ) { record.setRef(self); } //todo don't like this here, is awkward coupling
+}
+
+Query.prototype = {
+  'on': function(event, callback, cancel, context) {
+    if( arguments.length === 3 && util.isObject(cancel) ) {
+      context = cancel;
+      cancel = util.undef;
+    }
+
+    function cancelHandler(err) {
+      if( typeof(cancel) === 'function' && err !== null ) {
+        cancel.call(context, err);
+      }
+    }
+
+    this.$getRecord().watch(event, callback, cancelHandler, context);
+    return callback;
+  },
+
+  'once': function(event, callback, cancel, context) {
+    var self = this;
+    if( arguments.length === 3 && util.isObject(cancel) ) {
+      context = cancel;
+      cancel = util.undef;
+    }
+    function successHandler(snap) {
+      self.off(event, successHandler);
+      callback.call(context, snap);
+    }
+
+    function cancelHandler(err) {
+      if( typeof(cancel) === 'function' && err !== null ) {
+        cancel.call(context, err);
+      }
+    }
+
+    return this.on(event, successHandler, cancelHandler);
+  },
+
+  'off': function(event, callback, context) {
+    this.$getRecord().unwatch(event, callback, context);
+  },
+
+  /************************************
+   * Wrapped functions
+   ************************************/
+
+  'orderByChild': function() {
+    return this.$replicate('orderByChild', util.toArray(arguments));
+  },
+
+  'orderByKey': function() {
+    return this.$replicate('orderByKey', util.toArray(arguments));
+  },
+
+  'orderByValue': function() {
+    return this.$replicate('orderByValue', util.toArray(arguments));
+  },
+
+  'orderByPriority': function() {
+    return this.$replicate('orderByPriority', util.toArray(arguments));
+  },
+
+  'limitToFirst': function() {
+    return this.$replicate('limitToFirst', util.toArray(arguments));
+  },
+
+  'limitToLast': function() {
+    return this.$replicate('limitToLast', util.toArray(arguments));
+  },
+
+  /** @deprecated */
+  'limit': function() {
+    return this.$replicate('limit', util.toArray(arguments));
+  },
+
+  'startAt': function() {
+    return this.$replicate('startAt', util.toArray(arguments));
+  },
+
+  'endAt': function() {
+    return this.$replicate('endAt', util.toArray(arguments));
+  },
+
+  'equalTo': function() {
+    return this.$replicate('equalTo', util.toArray(arguments));
+  },
+
+  'ref': function() { return this._ref; },
+
+  /****************************
+   * PACKAGE FUNCTIONS (not API)
+   ***************************/
+
+  /** @returns {Record} */
+  '$getRecord': function() { return this._rec; },
+
+  /** @return {Firebase} */
+  '$getMaster': function() { return this._rec.getPathManager().first().ref(); },
+
+  /** @return {Array} */
+  '$getPaths': function() { return this._rec.getPathManager().getPaths(); },
+
+  /**
+   * @param {String} method
+   * @param {Array|arguments} args
+   * @returns {Query}
+   */
+  '$replicate': function(method, args) {
+    var rec = this.$getRecord();
+    var ref = this.$getMaster();
+    ref = ref[method].apply(ref, args);
+    return new Query(this._ref, Transmogrifier.replicate(rec, ref));
+  }
+};
+
+util.registerFirebaseWrapper(Query);
+module.exports = Query;
+},{"../../common":25,"./Transmogrifier":17}],12:[function(require,module,exports){
+'use strict';
+
+var FieldMap           = require('./FieldMap');
+var RecordField        = require('./RecordField');
+var AbstractRecord     = require('./AbstractRecord');
+var SnapshotFactory       = require('./SnapshotFactory');
+var util               = require('../../common');
+
+function Record(fieldMap) {
+  var name = fieldMap.getPathManager().first().id();
+  var url = util.mergeToString(fieldMap.getPathManager().getUrls());
+  this._super(fieldMap, name, url);
+  this._eventManagers = {};
+  util.log.debug('Record created', this.getName(), this.getUrl());
+}
+
+util.inherits(Record, AbstractRecord, {
+  makeChild: function(key) {
+    var fm = FieldMap.fieldMap(this.getFieldMap(), key);
+    return new RecordField(fm);
+  },
+
+  hasChild: function(snaps, key) {
+    var field = this.getFieldMap().getField(key);
+    if( !field ) { return false; }
+    var snap = this.getFieldMap().snapFor(snaps, key);
+    return snap !== null && snap.hasChild(key);
+  },
+
+  getChildSnaps: function(snaps, fieldName) {
+    var child;
+    var snap = this.getFieldMap().snapFor(snaps, fieldName);
+    var field = this.getFieldMap().getField(fieldName);
+    if( !field ) {
+      child = snap.child(fieldName);
+    }
+    else {
+      switch(field.id) {
+        case '$key':
+          throw new Error('Cannot get child snapshot from key (not a real child element)');
+        case '$value':
+          child = snap;
+          break;
+        default:
+          child = snap.child(field.id);
+      }
+    }
+    return [child];
+  },
+
+  /**
+   * Given a list of snapshots to iterate, returns the valid keys
+   * which exist in both the snapshots and the field map, in the
+   * order they should be iterated.
+   *
+   * Calls iterator with a {string|number} key for the next field to
+   * iterate only.
+   *
+   * If iterator returns true, this method should abort and return true,
+   * otherwise it should return false (same as Snapshot.forEach).
+   *
+   * @param {Array} snaps
+   * @param {function} iterator
+   * @param {object} [context]
+   * @return {boolean} true if aborted
+   * @abstract
+   */
+  forEachKey: function(snaps, iterator, context) {
+    function shouldIterate(snap, fieldId) {
+      switch(fieldId) {
+        case '$key':
+          return true;
+        case '$value':
+          return snap && snap.val() !== null;
+        default:
+          return snap && snap.hasChild(fieldId);
+      }
+    }
+    var map = this.getFieldMap();
+    return map.forEach(function(field) {
+      var snap = map.snapFor(snaps, field.alias);
+      if( shouldIterate(snap, field.id) ) {
+        return iterator.call(context, field.id, field.alias) === true;
+      }
+      return false;
+    });
+  },
+
+  /**
+   * Merge the data by iterating the snapshots in reverse order
+   * so that keys from later paths do not overwrite keys from earlier paths
+   *
+   * @param {Array} snaps list of snapshots to be merged
+   * @param {boolean} isExport true if exportVal() was called
+   * @returns {Object}
+   */
+  mergeData: function(snaps, isExport) {
+    var data = null, map = this.getFieldMap();
+
+    // if the master path is null, the record does not exist
+    // so we do not add any data
+    if( snaps.length > 0 && snaps[0].val() !== null ) {
+      data = util.extend.apply(null, util.map(snaps, function(ss) {
+        return map.extractData(ss, isExport);
+      }));
+
+      if( isExport && data !== null && snaps[0].getPriority() !== null ) {
+        if( !util.isObject(data) ) {
+          data = {'.value': data};
+        }
+        data['.priority'] = snaps[0].getPriority();
+      }
+    }
+
+    return data;
+  },
+
+  getPriority: function(snaps) {
+    return snaps[0].getPriority();
+  },
+
+  getClass: function() { return Record; },
+
+  saveData: function(data, props) {
+    var q = util.queue();
+    var map = this.getFieldMap();
+    var paths = this.getPathManager().getPaths();
+    if( props.isUpdate && !util.isObject(data) ) {
+      throw new Error('First argument to update() command must be an object');
+    }
+    if( data === null ) {
+      util.each(paths, function(p) {
+        if( !p.hasDependency() ) {
+          p.reff().remove(q.getHandler());
+        }
+      });
+    }
+    else if(util.isObject(data)) {
+      var denestedData = map.denest(data);
+      util.each(denestedData, function(parts) {
+        var path = parts.path;
+        var dataForPath = parts.data;
+        var ref = this._writeRef(denestedData, path);
+        if( ref !== null ) {
+          if( !util.isEmpty(dataForPath) || !props.isUpdate ) {
+            if( !util.isObject(dataForPath) ) {
+              dataForPath = {'.value': dataForPath};
+            }
+            if( !props.isUpdate ) {
+              addEmptyFields(map, path, dataForPath);
+            }
+            if( util.isDefined(props.priority) ) {
+              dataForPath['.priority'] = props.priority;
+            }
+            if( util.has(dataForPath, '.value') ) {
+              ref.set(dataForPath, q.getHandler());
+            }
+            else {
+              ref.update(dataForPath, q.getHandler());
+            }
+          }
+        }
+        else {
+          util.log.info('No dynamic key found for master', paths[0].ref().toString(), 'with dynamic path', path.ref().toString());
+        }
+      }, this);
+    }
+    else if( paths.length === 1 ) {
+      if( util.isDefined(props.priority) ) {
+        paths[0].ref().setWithPriority(data, props.priority, q.getHandler());
+      }
+      else {
+        paths[0].ref().set(data, q.getHandler());
+      }
+    }
+    else {
+      throw new Error('Cannot set multiple paths to a non-object value. ' +
+        'Since this is a NormalizedCollection, the data will be split between the paths. ' +
+        'But I can\'t split a primitive value');
+    }
+    q.handler(props.callback||util.noop, props.context);
+  },
+
+  getName: function() {
+    return this._name;
+  },
+
+  getUrl: function() {
+    return this._url;
+  },
+
+  _start: function(event) {
+    if( !util.has(this._eventManagers, event) ) {
+      util.log.debug('Record._start: event=%s, url=%s', event, this.getUrl());
+      this._eventManagers[event] = event === 'value'?
+        new ValueEventManager(this) : new ChildEventManager(event, this);
+    }
+    this._eventManagers[event].start();
+  },
+
+  _stop:   function(event) {
+    if (util.has(this._eventManagers, event)) {
+      util.log.debug('Record._stop: event=%s, url=%s', event, this.getUrl());
+      this._eventManagers[event].stop();
+    }
+  },
+
+  _writeRef: function(denestedData, path) {
+    var ref = path.reff();
+    var dep = path.getDependency();
+    if( dep !== null ) {
+      var depPath = this.getPathManager().getPath(dep.path);
+      var key = this._depKey(denestedData, depPath, dep.field);
+      ref = key === null? null : ref.child(key);
+    }
+    return ref;
+  },
+
+  _depKey: function(denestedData, path, fieldId) {
+    var key;
+    var dat = denestedData[path.name()].data;
+    switch(fieldId) {
+      case '$key':
+        key = path.id();
+        break;
+      case '$value':
+        key = util.has(dat, '.value')? dat['.value'] : util.isEmpty(dat)? null : dat;
+        break;
+      default:
+        key = util.has(dat, fieldId)? dat[fieldId] : null;
+    }
+    var type = typeof key;
+    if( key !== null && type !== 'string' ) {
+      throw new Error(
+          'Dynamic key values must be a string. Type was ' +
+          type + ' for ' + path.ref().toString() + '->' + fieldId
+      );
+    }
+    return key;
+  }
+});
+
+function ValueEventManager(rec) {
+  this.rec = rec;
+  this.pm = rec.getPathManager();
+  this.running = false;
+  this._init();
+}
+
+ValueEventManager.prototype = {
+  start: function() {
+    if( !this.running ) {
+      this.running = true;
+      util.each(this.pm.getPathNames(), this._startPath, this);
+    }
+  },
+
+  stop: function() {
+    if( this.running ) {
+      this.running = false;
+      util.each(this.subs, function(fn) {
+        fn();
+      });
+      this._init();
+    }
+  },
+
+  update: function(pathName, snap) {
+    this.snaps[pathName] = snap;
+    this._checkLoadState();
+    util.log('Record.ValueEventManager.update: url=%s, loadCompleted=%s', snap.ref().toString(), this.loadCompleted);
+    if( this.loadCompleted ) {
+      this.rec.trigger(new SnapshotFactory('value', this.rec.getName(), util.toArray(this.snaps)));
+    }
+  },
+
+  _startPath: function(pathName) {
+    var self = this;
+    var path = self.pm.getPath(pathName);
+    var fn = util.bind(self.update, self, pathName);
+    if( path.hasDependency() ) {
+      var dyno = new Dyno(path, this.rec.getFieldMap(), 'value', fn);
+      this.subs.push(dyno.dispose);
+    }
+    else {
+      path.ref().on('value', fn);
+      self.subs.push(function() {
+        path.ref().off('value', fn);
+      });
+    }
+  },
+
+  _checkLoadState: function() {
+    if( this.loadCompleted ) { return; }
+    var snaps = this.snaps;
+    var pathNames = this.pm.getPathNames();
+    this.loadCompleted = !util.contains(pathNames, function(p) {
+      return !snaps.hasOwnProperty(p);
+    });
+  },
+
+  _init: function() {
+    this.loadCompleted = false;
+    this.snaps = {};
+    this.subs = [];
+  }
+};
+
+function ChildEventManager(event, rec) {
+  this.event = event;
+  this.rec = rec;
+  this.map = rec.getFieldMap();
+  this.pm = rec.getPathManager();
+  this.subs = [];
+  this.dyno = null;
+}
+
+ChildEventManager.prototype = {
+  start: function() {
+    util.each(this.pm.getPathNames(), function(pathName) {
+      var event = this.event;
+      var path = this.pm.getPath(pathName);
+      var fn = util.bind(this.update, this);
+      if( path.hasDependency() ) {
+        this.dyno = new Dyno(path, this.map, event, fn);
+        this.subs.push(this.dyno.dispose);
+      }
+      else {
+        path.ref().on(event, fn);
+        this.subs.push(function() {
+          path.ref().off(event, fn);
+        });
+      }
+    }, this);
+  },
+
+  stop: function() {
+    util.each(this.subs, function(fn) {
+      fn();
+    });
+    this.subs = [];
+  },
+
+  update: function(snap, prev) {
+    if( snap !== null && this.map.aliasFor(snap.ref().toString()) !== null ) {
+      util.log('Record.ChildEventManager.update: event=%s, key=%s/%s', this.event, snap.ref().parent().key(), snap.key());
+      this.rec.trigger(new SnapshotFactory(this.event, snap.key(), snap, prev));
+    }
+  }
+};
+
+/**
+ * Process a path which depends on the value of another field. We have
+ * to monitor the field it depends on for value events and update
+ * the ref that we listen on whenever the id is modified.
+ *
+ * @param {Path} path
+ * @param {FieldMap } fieldMap
+ * @param {string} event
+ * @param {function} updateFn
+ * @constructor
+ */
+function Dyno(path, fieldMap, event, updateFn) {
+  var dep = path.getDependency();
+  var depPath = fieldMap.getPath(dep.path);
+  var depRef = depPath.ref();
+  if( dep.field === '$key' ) {
+    throw new Error('Dynamic paths do not support $key (you should probably just join on this path)');
+  }
+  if( dep.field !== '$value' ) {
+    depRef = depRef.child(dep.field);
+  }
+  var ref;
+
+  // establish our listener at the field which contains the id of our ref
+  var depFn = depRef.on('value', function(snap) {
+    if( ref && ref.key() !== snap.val() ) {
+      util.log.debug('Record.Dyno: stopped monitoring %s', ref.toString());
+      // any time the id changes, remove the old listener
+      ref.off(event, updateFn);
+      updateFn(null);
+    }
+    if( snap.val() !== null ) {
+      // establish our listener at the correct dynamic id for values
+      ref = path.ref().child(snap.val());
+      ref.on(event, updateFn);
+      util.log('Record.Dyno: monitoring %s', ref.toString()); //debug
+    }
+  });
+
+  // create a dispose method that can turn off all our event listeners
+  // when _stop is called
+  this.dispose = function() {
+    depRef.off('value', depFn);
+    if( ref ) {
+      ref.off(event, updateFn);
+    }
+  };
+}
+
+function addEmptyFields(map, path, dataToSave) {
+  util.each(map.fieldsFor(path.name()), function(f) {
+    switch(f.id) {
+      case '$key':
+        // ignore key
+        break;
+      case '$value':
+        if( !util.has(dataToSave, '.value') ) {
+          dataToSave['.value'] = null;
+        }
+        break;
+      default:
+        if( !util.has(dataToSave, f.id) ) {
+          dataToSave[f.id] = null;
+        }
+    }
+  });
+}
+
+module.exports = Record;
+},{"../../common":25,"./AbstractRecord":3,"./FieldMap":4,"./RecordField":13,"./SnapshotFactory":16}],13:[function(require,module,exports){
+'use strict';
+
+var PathManager        = require('./PathManager');
+var FieldMap           = require('./FieldMap');
+var AbstractRecord     = require('./AbstractRecord');
+var SnapshotFactory       = require('./SnapshotFactory');
+var util               = require('../../common');
+
+function RecordField(fieldMap) {
+  this.handlers = {};
+  this.path = fieldMap.getPathManager().first();
+  this._super(fieldMap, this.path.name(), this.path.url());
+  if( fieldMap.getPathManager().count() !== 1 ) {
+    throw new Error('RecordField must have exactly one path, but we got '+ fieldMap.getPathManager().count());
+  }
+  if( fieldMap.length !== 1 ) {
+    throw new Error('RecordField must have exactly one field, but we found '+ fieldMap.length);
+  }
+  util.log.debug('RecordField created', this.getName(), this.getUrl());
+}
+
+util.inherits(RecordField, AbstractRecord, {
+  makeChild: function(key) {
+    var pm = new PathManager([this.path.child(key)]);
+    var fm = new FieldMap(pm);
+    fm.add({key: FieldMap.key(pm.first(), '$value'), alias: key});
+    return new RecordField(fm);
+  },
+
+  hasChild: function(snaps, key) {
+    return snaps[0].hasChild(key);
+  },
+
+  getChildSnaps: function(snaps, fieldName) {
+    // there is exactly one snap and there are no aliases to deal with
+    return [snaps[0].child(fieldName)];
+  },
+
+  /**
+   * There is nothing to merge at this level because there is only one
+   * path and no field map
+   *
+   * @param {Array} snaps list of snapshots to be merged
+   * @param {boolean} isExport true if exportVal() was called
+   * @returns {Object}
+   */
+  mergeData: function(snaps, isExport) {
+    return isExport? snaps[0].exportVal() : snaps[0].val();
+  },
+
+  getPriority: function(snaps) {
+    return snaps[0].getPriority();
+  },
+
+  /**
+   * Iterates all keys of snapshot.
+   *
+   * Calls iterator with a {string|number} key for the next field to
+   * iterate only.
+   *
+   * If iterator returns true, this method should abort and return true,
+   * otherwise it should return false (same as Snapshot.forEach).
+   *
+   * @param {Array} snaps
+   * @param {function} iterator
+   * @param {object} [context]
+   * @return {boolean} true if aborted
+   * @abstract
+   */
+  forEachKey: function(snaps, iterator, context) {
+    var firstSnap = snaps[0];
+    return firstSnap.forEach(function(ss) {
+      iterator.call(context, ss.key(), ss.key());
+    });
+  },
+
+  saveData: function(data, opts) {
+    var ref = this.path.ref();
+    if( opts.isUpdate ) {
+      if( !util.isObject(data) ) {
+        throw new Error('When using update(), the data must be an object.');
+      }
+      if( util.has(opts, 'priority') ) {
+        data['.priority'] = opts.priority;
+      }
+      ref.update(data, wrapCallback(opts));
+    }
+    else if( util.has(opts, 'priority') ) {
+      ref.setWithPriority(data, opts.priority, wrapCallback(opts));
+    }
+    else {
+      ref.set(data, wrapCallback(opts));
+    }
+  },
+
+  getClass: function() { return RecordField; },
+
+  _start: function(event) {
+    var self = this;
+    this.handlers[event] = function(snap, prev) {
+      self.trigger(new SnapshotFactory(event, snap.key(), snap, prev));
+    };
+    this.path.ref().on(event, this.handlers[event], this._cancel, this);
+  },
+
+  _stop:   function(event) {
+    if( this.handlers.hasOwnProperty(event) ) {
+      this.path.ref().off(event, this.handlers[event], this);
+    }
+  }
+});
+
+function wrapCallback(opts) {
+  if( opts.callback ) {
+    return function() {
+      opts.callback.apply(opts.context, arguments);
+    };
+  }
+  else {
+    return util.noop;
+  }
+}
+
+module.exports = RecordField;
+},{"../../common":25,"./AbstractRecord":3,"./FieldMap":4,"./PathManager":10,"./SnapshotFactory":16}],14:[function(require,module,exports){
+'use strict';
+
+var Record = require('./Record');
+var AbstractRecord = require('./AbstractRecord');
+var util = require('../../common');
+var FieldMap = require('./FieldMap');
+var RecordSetEventManager = require('./RecordSetEventManager');
+
+/**
+ * A "Record" (see AbstractRecord) represents a merged set of data used by NormalizedRef.
+ * It is used by NormalizedRef to create snapshots and monitor Firebase for data changes.
+ *
+ * A RecordSet represents the root level of NormalizedCollection's output. It is a list of
+ * collections (from multiple paths in Firebase) to be joined together.
+ *
+ * This is, for the purposes of a NormalizedCollections, the root of the data. Calls to parent()
+ * from here should return null, just like they would from the root of a Firebase. This is because
+ * the parent of a normalized collection is ambiguous, so there is no higher level of data.
+ *
+ * @param fieldMap this is the field map to be applied to each Record created when calling child()
+ * @param whereClause this filters the output data and events
+ * @constructor
+ */
+function RecordSet(fieldMap, whereClause) {
+  var name = util.mergeToString(fieldMap.getPathManager().getPathNames());
+  var url = util.mergeToString(fieldMap.getPathManager().getUrls());
+
+  // AbstractRecord makes this observable and abstracts some common impl details
+  // between RecordSet, Record, and RecordField
+  this._super(fieldMap, name, url);
+
+  // Used to filter the merged data and determine which merged Records should trigger events and
+  // which ones should be ignored
+  this.filters = whereClause;
+
+  // the RecordSetEventManager handles Firebase events and calls event handlers on
+  // this RecordSet appropriately. See RecordSetEventManager for more details
+  this.monitor = new RecordSetEventManager(this);
+}
+
+util.inherits(RecordSet, AbstractRecord, {
+  makeChild: function(key) {
+    var fm = FieldMap.recordMap(this.getFieldMap(), key);
+    return new Record(fm);
+  },
+
+  /**
+   * Override AbstractRecord's hasChild since we are dealing
+   * with record ids at this level. We use the master list to determine
+   * if records exist, so it's a pretty straightforward hasChild
+   * on the first snapshot.
+   *
+   * @param {Array} snaps a list of array snapshots to test for child
+   * @param {string} key
+   */
+  hasChild: function(snaps, key) {
+    return util.contains(snaps, function(s) {
+      return s.key() === key;
+    });
+  },
+
+  getChildSnaps: function(snapsArray, recordId) {
+    return util.filter(snapsArray, function(s) {
+      return s.key() === recordId;
+    });
+  },
+
+  /**
+   * Since the snapshots attached to this level are records, there isn't much
+   * to do for a merge. Just put them all together.
+   *
+   * @param {Array} snaps list of snapshots to be merged
+   * @param {boolean} isExport true if exportVal() was called
+   * @returns {Object}
+   */
+  mergeData: function(snaps, isExport) {
+    var self = this, out = null;
+    // if the master path is empty, there is no data to be merged
+    if( snaps.length && snaps[0].val() !== null ) {
+      out = {};
+      util.each(snaps, function(snap) {
+        if( snap.val() !== null && self.filters.test(snap.val(), snap.key(), snap.getPriority()) ) {
+          out[snap.key()] = isExport? snap.exportVal() : snap.val();
+        }
+      });
+    }
+    return out;
+  },
+
+  getPriority: function() {
+    return null;
+  },
+
+  /**
+   * Given a list of snapshots to iterate, returns the valid keys
+   * which exist in both the snapshots and the field map, in the
+   * order they should be iterated.
+   *
+   * Calls iterator with a {string|number} key for the next field to
+   * iterate only.
+   *
+   * If iterator returns true, this method should abort and return true,
+   * otherwise it should return false (same as Snapshot.forEach).
+   *
+   * @param {Array} snaps
+   * @param {function} iterator
+   * @param {object} [context]
+   * @return {boolean} true if aborted
+   * @abstract
+   */
+  forEachKey: function(snaps, iterator, context) {
+    snaps.forEach(function(snap) {
+      return iterator.call(context, snap.key(), snap.key());
+    });
+  },
+
+  getClass: function() { return RecordSet; },
+
+  /**
+   * Saving a record set is done by grabbing each child record and calling save against that.
+   * This is the easiest approach since we must distribute fields to each appropriate path.
+   * It might be more efficient to bulk these into a single write op, and perhaps we should
+   * explore that if this proves to be slow.
+   *
+   * @param data
+   * @param {Object} opts
+   */
+  saveData: function(data, opts) {
+    var q = util.queue();
+    if( data === null ) {
+      util.each(this.getPathManager().getPaths(), function(path) {
+        path.ref().remove(q.getHandler());
+      });
+    }
+    else if( !util.isObject(data) ) {
+      throw new Error('Calls to set() or update() on a NormalizedCollection must pass either ' +
+          'null or an object value. There is no way to split a primitive value between the paths');
+    }
+    else {
+      util.each(data, function(v, k) {
+        if( k === '.value' || k === '.priority' ) {
+          throw new Error('Cannot use .priority or .value on the root path of a NormalizedCollection. ' +
+              'You probably meant to sort the records anyway (i.e. one level lower).');
+        }
+        this.child(k).saveData(v, {isUpdate: opts.isUpdate, callback: q.getHandler()});
+      }, this);
+      if( opts.priority ) {
+        this.getPathManager().first().ref().setPriority(opts.priority, q.getHandler());
+      }
+    }
+    q.handler(opts.callback||util.noop, opts.context);
+  },
+
+  /**
+   * Return the correct child key for a snapshot by determining if its corresponding path
+   * has dependencies. If so, we look up the id and return that child, otherwise, we just
+   * return the child for the recordId.
+   *
+   * If a dependency exists, but the required field is null or invalid, then we just return
+   * null in place of the snapshot.
+   *
+   * @private
+   */
+  _getChildKey: function(snap, snapsArray, recordId) {
+    var key = recordId;
+    var path = this.getPathManager().getPathFor(snap.ref().toString());
+    // resolve any dependencies to determine the child key's value
+    if( path.hasDependency() ) {
+      var dep = path.getDependency();
+      var depPath = this.getFieldMap().getPath(dep.path);
+      if( !depPath ) {
+        throw new Error('Invalid dependency path. ' + snap.ref.toString() +
+        ' depends on ' + dep.path +
+        ', but that alias does not exist in the paths provided.');
+      }
+      var depSnap = util.find(snapsArray, function(snap) {
+        return snap.ref().toString() === depPath.url();
+      });
+      if( depSnap ) {
+        depSnap = depSnap.child(recordId);
+        if( dep.field !== '$value' ) {
+          depSnap = depSnap.child(dep.field);
+        }
+        key = depSnap.val();
+      }
+      else {
+        key = null;
+      }
+    }
+    return key;
+  },
+
+  _start: function() {
+    this.monitor.start();
+  },
+
+  _stop:   function(event, count) {
+    if( count === 0 ) { this.monitor.stop(); }
+  }
+});
+
+module.exports = RecordSet;
+},{"../../common":25,"./AbstractRecord":3,"./FieldMap":4,"./Record":12,"./RecordSetEventManager":15}],15:[function(require,module,exports){
+'use strict';
+
+var SnapshotFactory = require('./SnapshotFactory');
+var util = require('../../common');
+
+/**
+ * Monitors the references attached to a RecordSet and maintains a cache of
+ * current snapshots (inside RecordList below). Any time there is an update, this calls
+ * RecordSet.trigger() to notify event listeners.
+ *
+ * @param parentRec
+ * @constructor
+ */
+function RecordSetEventManager(parentRec) {
+  var pm = parentRec.getPathManager();
+  this.masterRef = pm.first().ref();
+  this.url = this.masterRef.toString();
+  this.recList = new RecordList(parentRec, this.url);
+  this.running = false;
+}
+
+RecordSetEventManager.prototype = {
+  start: function() {
+    if( !this.running ) {
+      util.log('RecordSetEventManager: Loading normalized records from master list %s', this.url);
+      this.running = true;
+      this.masterRef.on('child_added',   this._add,    this);
+      this.masterRef.on('child_removed', this._remove, this);
+      this.masterRef.on('child_moved',   this._move,   this);
+      // make sure all existing keys are loaded into memory before we let recList trigger value events
+      this.masterRef.once('value', this.recList.masterPathLoaded, this.recList);
+    }
+    return this;
+  },
+
+  stop: function() {
+    if( this.running ) {
+      util.log('RecordSetEventManager: Stopped monitoring master list %s', this.url);
+      this.running = false;
+      this.masterRef.off('child_added',   this._add,    this);
+      this.masterRef.off('child_removed', this._remove, this);
+      this.masterRef.off('child_moved',   this._move,   this);
+      this.recList.unloaded();
+    }
+    return this;
+  },
+
+  _add: function(snap, prevChild) {
+    this.recList.add(snap.key(), prevChild);
+  },
+
+  _remove: function(snap) {
+    this.recList.remove(snap.key());
+  },
+
+  _move: function(snap, prevChild) {
+    this.recList.move(snap.key(), prevChild);
+  }
+};
+
+function RecordList(observable, url) {
+  this.obs = observable;
+  this.url = url;
+  this._reset();
+}
+
+RecordList.prototype = {
+  add: function(key, prevChild) {
+    util.log.debug('RecordList.add: key=%s, prevChild=%s', key, prevChild);
+    var rec = this.obs.child(key);
+    var fn = util.bind(this._valueUpdated, this, key);
+    this.loading[key] = {rec: rec, prev: prevChild, fn: fn, unwatch: function() { rec.unwatch('value', fn); }};
+    if( !this.loadComplete ) {
+      this.initialKeysLeft.push(key);
+    }
+    rec.watch('value', fn);
+  },
+
+  remove: function(key) {
+    util.log.debug('RecordList.remove: key=%s', key);
+    var oldSnap = this._dropRecord(key);
+    if( oldSnap !== null ) {
+      this._notify('child_removed', key, oldSnap);
+    }
+  },
+
+  move: function(key, prevChild) {
+    if(util.has(this.recs, key)) {
+      var currPos = util.indexOf(this.recIds, key);
+      this.recIds.splice(currPos, 1);
+      this._putAfter(key, prevChild);
+      this._notify('child_moved', key);
+    }
+  },
+
+  masterPathLoaded: function() {
+    util.log.debug('RecordList: Initial data has been loaded from master list at %s', this.url);
+    this.masterLoaded = true;
+    if( this._checkLoadState() ) {
+      this._notifyValue();
+    }
+  },
+
+  unloaded: function() {
+    this._reset();
+  },
+
+  findKey: function(key) {
+    return util.indexOf(this.recIds, key);
+  },
+
+  _reset: function() {
+    util.each(this.recs, function(rec, key) {
+      this.remove(key);
+    }, this);
+    util.each(this.filtered, function(rec, key) {
+      this._dropRecord(key);
+    }, this);
+    util.each(this.loading, function(rec, key) {
+      this._dropRecord(key);
+    }, this);
+    this.recs = {};
+    this.recIds = [];
+    this.snaps = {};
+    this.loading = {};
+    this.filtered = {};
+    this.loadComplete = false;
+    this.initialKeysLeft = [];
+    this.masterLoaded = false;
+  },
+
+  _valueUpdated: function(key, snap) {
+    var rec;
+    this.snaps[key] = snap;
+    if(util.has(this.loading, key)) {
+      // record has finished loading and merging paths
+      rec = this.loading[key];
+      delete this.loading[key];
+      this._processAdd(snap, rec);
+    }
+    else if(util.has(this.recs, key)) {
+      rec = this.recs[key];
+      this._processChange(snap, rec);
+    }
+    else if(util.has(this.filtered, key)) {
+      if( snap.val() !== null && this.obs.filters.test(snap.val(), key, snap.getPriority()) ) {
+        // the record data has changed and it is no longer part of the filtered
+        // content, so treat it as a newly added record
+        rec = this.filtered[key];
+        delete this.filtered[key];
+        util.log('RecordList: Unfiltered key %s', key);
+        this._processAdd(snap, rec);
+      }
+    }
+    else {
+      util.log('RecordList: Orphan key %s ignored. Probably a concurrent edit.', key);
+    }
+  },
+
+  _processAdd: function(snap, rec) {
+    var key = snap.key();
+    if( this.obs.filters.test(snap.val(), key, snap.getPriority()) ) {
+      this.recs[key] = rec;
+      this._putAfter(key, rec.prev);
+      this._notify('child_added', key);
+    }
+    else {
+      util.log('RecordList: Filtered key %s', key);
+      this.filtered[key] = rec;
+    }
+    if( this._checkLoadState(key) ) {
+      this._notifyValue();
+    }
+  },
+
+  _processChange: function(snap, rec) {
+    // null records are valid at the record level and can trigger value events, but at
+    // the Set level, they mean the record is in the process of being deleted so we
+    // ignore the value event here
+    if( snap.val() !== null ) {
+      var key = snap.key();
+      if( this.obs.filters.test(snap.val(), key, snap.getPriority()) ) {
+        // a changed record that has not been filtered
+        this._notify('child_changed', key);
+      }
+      else {
+        // record changes caused it to become filtered, so treat it as a removed rec
+        // however, we'll continue to watch it for changes so it can be unfiltered later
+        delete this.recs[key];
+        this.filtered[key] = rec;
+        this._notify('child_removed', key, this.snaps[key]);
+      }
+    }
+  },
+
+  _notify: function(event, key, oldSnap) {
+    var prev;
+    if( event === 'child_added' || event === 'child_moved' ) {
+      prev = this._getPrevChild(key);
+    }
+    util.log('RecordList._notify: event=%s, key=%s, prev=%s', event, key, prev);
+    var factory = new SnapshotFactory(event, key, oldSnap||this.snaps[key], prev);
+    this.obs.trigger(factory);
+    this._notifyValue();
+  },
+
+  _notifyValue: function() {
+    if( this.loadComplete ) {
+      util.log.debug('RecordList._notifyValue: snap_keys=%s', util.keys(this.snaps));
+      var factory = new SnapshotFactory('value', null, util.toArray(this.snaps));
+      this.obs.trigger(factory);
+    }
+  },
+
+  _getPrevChild: function(key) {
+    if( !this.recIds.length ) { return null; }
+    var pos = this.findKey(key);
+    if( pos === -1 ) {
+      return this.recIds[this.recIds.length-1];
+    }
+    else if( pos === 0 ) {
+      return null;
+    }
+    else {
+      return this.recIds[pos-1];
+    }
+  },
+
+  _posFor: function(prevKey) {
+    var pos, x;
+    if( prevKey === null ) {
+      pos = 0;
+    }
+    else {
+      x = this.findKey(prevKey);
+      pos = x === -1? this.recIds.length : x+1;
+    }
+    return pos;
+  },
+
+  _putAfter: function(key, prevChild) {
+    var newPos = this._posFor(prevChild);
+    this.recIds.splice(newPos, 0, key);
+  },
+
+  _dropRecord: function(key) {
+    var res = null;
+    if(this.recs[key]) {
+      res = this.snaps[key];
+      this.recs[key].unwatch();
+    }
+    if(this.loading[key]) {
+      this.loading[key].unwatch();
+    }
+    if(util.has(this.filtered, key)) {
+      this.filtered[key].unwatch();
+    }
+    delete this.loading[key];
+    delete this.snaps[key];
+    delete this.filtered[key];
+    delete this.recs[key];
+    util.remove(this.recIds, key);
+    return res;
+  },
+
+  /**
+   * Because the initial once('value') will probably trigger before all the child paths
+   * are retrieved (remember that we are monitoring multiple paths per child), we need
+   * to wait for them to load in before triggering our first value event.
+   * @private
+   */
+  _checkLoadState: function(key) {
+    if( !this.loadComplete ) {
+      if( key ) {
+        util.remove(this.initialKeysLeft, key);
+      }
+      if( !this.initialKeysLeft.length && this.masterLoaded ) {
+        this.loadComplete = true;
+        return true;
+      }
+    }
+    return false;
+  }
+};
+
+module.exports = RecordSetEventManager;
+},{"../../common":25,"./SnapshotFactory":16}],16:[function(require,module,exports){
+
+'use strict';
+
+var util = require('../../common');
+var NormalizedSnapshot = require('./NormalizedSnapshot.js');
+
+function SnapshotFactory(event, key, snaps, prevChild) {
+  this.event = event;
+  this.key = key;
+  this.snaps = unwrapSnapshots(snaps);
+  this.prevChild = prevChild;
+  assertValidTrigger(this);
+}
+
+SnapshotFactory.prototype.create = function(ref) {
+  var snapshot;
+  if( this.event === 'value' ) {
+    snapshot = new NormalizedSnapshot(ref, this.snaps);
+  }
+  else {
+    snapshot = new NormalizedSnapshot(ref.ref().child(this.key), this.snaps);
+  }
+  return snapshot;
+};
+
+SnapshotFactory.prototype.toString = function() {
+  return util.printf(
+    'SnapshotFactory(event=%s, key=%s, numberOfSnapshots=%s, prevChild=%s',
+    this.event, this.key, this.snaps.length, this.prevChild === util.undef? 'undefined' : this.prevChild
+  );
+};
+
+function assertValidTrigger(trigger) {
+  switch(trigger.event) {
+    case 'value':
+      break;
+    case 'child_added':
+    case 'child_moved':
+      if( typeof trigger.key !== 'string' || !trigger.key ) {
+        throw new Error('Invalid trigger key ' + trigger.key);
+      }
+      if( trigger.prevChild === util.undef ) {
+        throw new Error('Triggers must provide a valid prevChild value for child_added and child_moved events');
+      }
+      break;
+    case 'child_removed':
+    case 'child_changed':
+      if( typeof trigger.key !== 'string' || !trigger.key ) {
+        throw new Error('Invalid trigger key ' + trigger.key);
+      }
+      break;
+    default:
+      throw new Error('Invalid trigger event type: ' + trigger.event);
+  }
+}
+
+function unwrapSnapshots(snaps) {
+  if( snaps instanceof NormalizedSnapshot ) {
+    return snaps._snaps.slice();
+  }
+  if( !util.isArray(snaps) ) {
+    return [snaps];
+  }
+  return snaps.slice();
+}
+
+module.exports = SnapshotFactory;
+},{"../../common":25,"./NormalizedSnapshot.js":8}],17:[function(require,module,exports){
+'use strict';
+
+var util        = require('../../common');
+var PathManager = require('./PathManager');
+var Path        = require('./Path');
+var FieldMap    = require('./FieldMap');
+var RecordSet   = require('./RecordSet');
+
+module.exports = {
+  replicate: function(record, newMasterRef) {
+    // create a new set of paths
+    var paths = record.getPathManager().getPaths().slice(0);
+    var firstPath = paths[0];
+    paths[0] = new Path([newMasterRef, firstPath.name(), firstPath.getDependency()]);
+    var mgr = new PathManager(util.map(paths, function(p) { return p.clone(); }));
+
+    // create a new field map from the updated paths
+    var fieldMap = new FieldMap(mgr);
+    record.getFieldMap().forEach(fieldMap.add, fieldMap);
+
+    // recreate the AbstractRecord instance
+    var Clazz = record.getClass();
+    var rec;
+    if( Clazz === RecordSet ) {
+      rec = new Clazz(fieldMap, record.filters);
+    }
+    else {
+      rec = new Clazz(fieldMap);
+    }
+
+    // done!
+    return rec;
+  }
+};
+},{"../../common":25,"./FieldMap":4,"./Path":9,"./PathManager":10,"./RecordSet":14}],18:[function(require,module,exports){
+'use strict';
+var util = require('../common');
+var Scroll = require('./libs/Scroll.js');
+var Paginate = require('./libs/Paginate.js');
+var ReadOnlyRef = require('./libs/ReadOnlyRef.js');
+
+var DEFAULTS = {
+  field: null,
+  pageSize: 10,
+  windowSize: 250
+};
+
+exports.Scroll = function(baseRef, sortField, opts, desc) {
+  if( !util.isFirebaseRef(baseRef) || util.isQueryRef(baseRef) ) {
+    throw new Error('First argument to Firebase.util.Scroll must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).');
+  }
+
+  if( typeof sortField !== 'string' ) {
+    throw new Error('Second argument to Firebase.util.Scroll must be a valid string');
+  }
+  if( arguments.length > 2 && !util.isObject(opts) ) {
+    throw new Error('Optional third argument to Firebase.util.Scroll must be an object of key/value pairs');
+  }
+  var ref = new ReadOnlyRef(baseRef);
+  ref.scroll = new Scroll(ref, sortField, calcOpts(opts, 'windowSize', 'Scroll'), desc);
+  return ref;
+};
+
+exports.Paginate = function(baseRef, sortField, opts) {
+  if( !util.isFirebaseRef(baseRef) || util.isQueryRef(baseRef) ) {
+    throw new Error('First argument to Firebase.util.Paginate must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).');
+  }
+  if( typeof sortField !== 'string' ) {
+    throw new Error('Second argument to Firebase.util.Paginate must be a valid string');
+  }
+  if( arguments.length > 2 && !util.isObject(opts) ) {
+    throw new Error('Optional third argument to Firebase.util.Paginate must be an object of key/value pairs');
+  }
+  var ref = new ReadOnlyRef(baseRef);
+  ref.page = new Paginate(ref, sortField, calcOpts(opts, 'pageSize', 'Paginate'));
+  return ref;
+};
+
+function calcOpts(opts, maxFromKey, method) {
+  var res = util.extend({}, DEFAULTS, opts);
+  if( !res.maxCacheSize ) {
+    res.maxCacheSize = res[maxFromKey] * 3;
+  }
+  assertNumber(res, maxFromKey, method);
+  assertNumber(res, 'maxCacheSize', method);
+  return res;
+}
+
+function assertNumber(obj, key, method) {
+  if( typeof obj[key] !== 'number' ) {
+    throw new Error('Argument ' + key + ' passed into opts for ' + method + 'must be a number' );
+  }
+}
+},{"../common":25,"./libs/Paginate.js":21,"./libs/ReadOnlyRef.js":22,"./libs/Scroll.js":23}],19:[function(require,module,exports){
+'use strict';
+var util = require('../../common');
+var Offset = require('./Offset');
+
+function Cache(outRef, sortField, maxRecordsLoaded, desc) {
+  util.log.debug('Cache: caching %s using field=%s maxRecordsLoaded=%d', outRef.toString(), sortField, maxRecordsLoaded);
+  this.offset = new Offset({field: sortField, max: maxRecordsLoaded, ref: outRef.ref()});
+  this.outRef = outRef;
+  this.inRef = null;
+  this.queryRef = null;
+  this.countRef = null;
+  this.keys = {};
+  this.start = 0;
+  this.count = -1;
+  this.endCount = -1;
+  this.nextListeners = [];
+  this.offset.observe(this._keyChange, this);
+  this.desc = desc;
+}
+
+Cache.prototype.moveTo = function(startOffset, numberOfRecords) {
+  util.log.debug('Cache.moveTo: startOffset=%d, numberOfRecords=%d', startOffset, numberOfRecords);
+  var s = this.start, e = this.count;
+  this.start = startOffset;
+  this.count = numberOfRecords;
+  this.endCount = this.start + this.count;
+  if( s !== this.start ) {
+    this.offset.goTo(startOffset, numberOfRecords);
+  }
+  else if( e !== this.count ) {
+    this._refChange();
+  }
+};
+
+Cache.prototype.hasNext = function() {
+  return this.count === -1 || this.endCount > this.start + this.count;
+};
+
+Cache.prototype.hasPrev = function() {
+  return this.start > 0;
+};
+
+Cache.prototype.observeHasNext = function(callback, context) {
+  var list = this.nextListeners;
+  var parts = [callback, context];
+  list.push(parts);
+  return function() {
+    util.remove(list, parts);
+  };
+};
+
+Cache.prototype.destroy = function() {
+  this._unsubscribe();
+  this.offset.destroy();
+  this.offset = null;
+  this.start = 0;
+  this.count = -1;
+  this.inRef = null;
+  this.outRef = null;
+  this.queryRef = null;
+  this.countRef = null;
+  this.keys = null;
+  this.nextListeners = null;
+};
+
+Cache.prototype._keyChange = function(val, key, ref) {
+  this.inRef = ref;
+  util.log.debug('Cache._keyChange: %s %s %s', val, key, ref.toString());
+  this._refChange();
+};
+
+Cache.prototype._unsubscribe = function() {
+  if( this.queryRef ) {
+    this.queryRef.off('child_added', this._add, this);
+    this.queryRef.off('child_removed', this._remove, this);
+    this.queryRef.off('child_moved', this._move, this);
+    this.queryRef.off('child_changed', this._change, this);
+    this.queryRef.off('value', this._value, this);
+    this.queryRef.off('value', this._removeOrphans, this);
+    this.queryRef = null;
+  }
+  if( this.countRef ) {
+    this.countRef.off('value', this._count, this);
+    this.countRef = null;
+  }
+};
+
+Cache.prototype._refChange = function() {
+  this._unsubscribe();
+  if( this.inRef && this.count > -1 ) {
+    this.countRef = this.desc ? this.inRef.limitToLast(this.count+1) : this.inRef.limitToFirst(this.count+1);
+    this.countRef.on('value', this._count, this);
+    //todo we should queue all the events until the once('value') is completed
+    //todo so that we can trigger removed before added
+    this.queryRef = this.desc ? this.inRef.limitToLast(this.count) : this.inRef.limitToFirst(this.count);
+    this.queryRef.on('child_added', this._add, this);
+    this.queryRef.on('child_removed', this._remove, this);
+    this.queryRef.on('child_moved', this._move, this);
+    this.queryRef.on('child_changed', this._change, this);
+    this.queryRef.on('value', this._value, this);
+    this.queryRef.once('value', this._removeOrphans, this);
+  }
+};
+
+Cache.prototype._add = function(snap, prevChild) {
+  var key = snap.key();
+  if( !util.has(this.keys, key) ) {
+    this.keys[key] = snap;
+    this.outRef.$trigger('child_added', snap, prevChild);
+  }
+  else if( !util.isEqual(this.keys[key], snap.val()) ) {
+    this._change(snap);
+  }
+};
+
+Cache.prototype._remove = function(snap) {
+  var key = snap.key();
+  if( util.has(this.keys, key) ) {
+    this.outRef.$trigger('child_removed', snap);
+    delete this.keys[key];
+  }
+};
+
+Cache.prototype._move = function(snap, prevChild) {
+  var key = snap.key();
+  if( util.has(this.keys, key) ) {
+    this.keys[key] = snap;
+    this.outRef.$trigger('child_moved', snap, prevChild);
+  }
+};
+
+Cache.prototype._change = function(snap) {
+  this.keys[snap.key()] = snap;
+  this.outRef.$trigger('child_changed', snap);
+};
+
+Cache.prototype._value = function(snap) {
+  this.outRef.$trigger('value', snap);
+};
+
+Cache.prototype._count = function(snap) {
+  this.endCount = this.start + snap.numChildren();
+  var hasNext = this.hasNext();
+  util.each(this.nextListeners, function(parts) {
+    parts[0].call(parts[1], hasNext);
+  });
+};
+
+Cache.prototype._removeOrphans = function(valueSnap) {
+  util.each(this.keys, function(cachedSnap, key) {
+    if( !valueSnap.hasChild(key) ) {
+      this.outRef.$trigger('child_removed', cachedSnap);
+      delete this.keys[key];
+    }
+  }, this);
+};
+
+module.exports = Cache;
+},{"../../common":25,"./Offset":20}],20:[function(require,module,exports){
+'use strict';
+var util = require('../../common');
+
+function Offset(opts) {
+  this.keys = [];
+  this.field = opts.field;
+  this.ref = baseRef(opts.ref, opts.field);
+  this.max = opts.max;
+  this.listeners = [];
+  this.curr = 0;
+  this.sub = null;
+  this.isSubscribing = false;
+  this.lastNotifyValue = util.undef;
+  this._debouncedRecache = debounce(function() {
+    util.log.debug('Offset._debouncedRecache: recaching keys for offset %d', this.curr);
+    this.keys = [];
+    this._grow(this._listen);
+  }, this, 100, 1000);
+}
+
+Offset.prototype.goTo = function(newOffset) {
+  if( newOffset !== this.curr ) {
+    util.log('Offset.goTo: offset changed from %d to %d', this.curr, newOffset);
+    this.curr = newOffset;
+    this.lastNotifyValue = util.undef;
+    this._listen();
+  }
+};
+
+Offset.prototype.observe = function(callback, context) {
+  this.listeners.push([callback, context]);
+  var key = this.getKey();
+  var ref = offsetRef(this.ref, key);
+  callback.call(context, key && key.val, key && key.key, ref);
+};
+
+Offset.prototype.getKey = function(offset) {
+  if( !arguments.length ) { offset = this.curr; }
+  if( offset === 0 ) { return null; }
+  return this.keys.length > offset && this.keys[offset];
+};
+
+Offset.prototype.destroy = function() {
+  this._unsubscribe();
+  this.curr = 0;
+  this.keys = [];
+  this.lastNotifyValue = util.undef;
+  this.isSubscribing = false;
+};
+
+Offset.prototype._notify = function() {
+  var key = this.getKey();
+  if( !util.isEqual(this.lastNotifyValue, key) ) {
+    util.log('Offset._notify: key at offset %d is %s', this.curr, key && key.key);
+    this.lastNotifyValue = key;
+    var ref = offsetRef(this.ref, key);
+    util.each(this.listeners, function(parts) {
+      parts[0].call(parts[1], key && key.val, key && key.key, ref);
+    });
+  }
+};
+
+Offset.prototype._recache = function() {
+  if( !this.isSubscribing ) {
+    this._debouncedRecache();
+  }
+};
+
+var killCount = 0;
+Offset.prototype._grow = function(callback) {
+  var self = this;
+  var len = self.keys.length;
+  if( self.curr >= len ) {
+    var oldKey = self.getKey();
+    var startAt = lastKey(self.keys);
+    var limit = Math.min(self.curr + (startAt? 2 : 1) - len, self.max);
+    var ref = startAt !== null? self.ref.startAt(startAt.val, startAt.key) : self.ref;
+    ref.limitToFirst(limit).once('value', function(snap) {
+      var skipFirst = startAt !== null;
+      snap.forEach(function(ss) {
+        if( skipFirst ) {
+          skipFirst = false;
+          return;
+        }
+        self.keys.push(extractKey(ss, self.field));
+      });
+      if( killCount++ > 10000 ) {
+        throw new Error('Tried to fetch more than 10,000 pages to determine the correct offset. Giving up now. Sorry.');
+      }
+      if( self.curr >= self.keys.length && snap.numChildren() === limit ) {
+        // prevents recursive scoping
+        setTimeout(util.bind(self._grow, self, callback), 0);
+      }
+      else {
+        killCount = 0;
+        util.log.debug('Offset._grow: Cached %d keys', self.keys.length);
+        callback.call(self, !util.isEqual(self.getKey(), oldKey));
+      }
+    });
+  }
+  else {
+    callback.call(self, false);
+  }
+};
+
+Offset.prototype._startOffset = function() {
+  return Math.max(0, this.curr - this.max, this.curr - 10);
+};
+
+Offset.prototype._queryRef = function() {
+  var start = this._startOffset();
+  var ref = this.ref;
+  if( start > 0 ) {
+    var key = this.getKey(start);
+    ref = ref.startAt(key.val, key.key);
+  }
+  return ref.limitToLast(Math.max(this.curr - start, 1));
+};
+
+Offset.prototype._moved = function(snap) {
+  if( snap.key() === this.getKey() ) {
+    this._recache();
+  }
+};
+
+Offset.prototype._unsubscribe = function() {
+  if( this.sub ) {
+    this.sub.off('child_added', this._recache, this);
+    this.sub.off('child_moved', this._moved, this);
+    this.sub.off('child_removed', this._recache, this);
+    this.sub.off('value', this._doneSubscribing, this);
+    this.sub = null;
+  }
+};
+
+Offset.prototype._subscribe = function() {
+  this._unsubscribe();
+  this.sub = this._queryRef();
+  this.isSubscribing = true;
+  this.sub.on('child_added', this._recache, this);
+  this.sub.on('child_moved', this._moved, this);
+  this.sub.on('child_removed', this._recache, this);
+  this.sub.once('value', this._doneSubscribing, this);
+};
+
+Offset.prototype._doneSubscribing = function() {
+  this.isSubscribing = false;
+  this._notify();
+};
+
+Offset.prototype._monitorEmptyOffset = function() {
+  var self = this;
+  var ref = self.ref;
+  var key = null;
+  function fn(snap) {
+    var count = snap.numChildren();
+    if( count > (key === null? 0 : 1) ) {
+      util.log.debug('Offset._monitorEmptyOffset: A value exists now.');
+      ref.off('value', fn);
+      self._grow();
+    }
+  }
+  if( this.keys.length ) {
+    key = lastKey(this.keys);
+    ref = ref.startAt(key.val, key.key);
+  }
+  util.log.debug('Offset._monitorEmptyOffset: No value exists at offset %d, currently %d keys at this path. Watching for a new value.', this.curr, this.keys.length);
+  ref.limitToFirst(2).on('value', fn);
+};
+
+Offset.prototype._listen = function() {
+  this._unsubscribe();
+  if( this.curr >= this.keys.length ) {
+    this._grow(function(/*changed*/) {
+      if( this.keys.length >= this.curr ) {
+        this._subscribe();
+      }
+      else {
+        this._monitorEmptyOffset();
+        this._notify();
+      }
+    });
+  }
+  else {
+    this._subscribe();
+  }
+};
+
+function extractKey(snap, field) {
+  var v;
+  switch(field) {
+    case '$key':
+      v = snap.key();
+      break;
+    case '$priority':
+      v = snap.getPriority();
+      break;
+    case '$value':
+      v = snap.val();
+      break;
+    default:
+      var obj = snap.val();
+      if( !util.isObject(obj) ) {
+        throw new Error('A value of type ' + typeof obj + 'Was found. ' +
+        'But we are attempting to order by child field "' + field + '". ' +
+        'Pagination requires all records to be objects or it can\'t determine an ' +
+        'appropriate offset value.');
+      }
+      else {
+        v = obj[field];
+      }
+  }
+  return {val: v, key: snap.key()};
+}
+
+function offsetRef(baseRef, startKey) {
+  if( startKey === false ) {
+    return null;
+  }
+  else if( startKey === null ) {
+    return baseRef;
+  }
+  else {
+    return baseRef.startAt(startKey.val, startKey.key);
+  }
+}
+
+function baseRef(ref, field) {
+  if( field === '$key' ) {
+    return ref.orderByKey();
+  }
+  else if( field === '$priority' ) {
+    return ref.orderByPriority();
+  }
+  else if( field === '$value' ) {
+    return ref.orderByValue();
+  }
+  else {
+    return ref.orderByChild(field);
+  }
+}
+
+/**
+ * A rudimentary debounce method
+ * @param {function} fn the function to debounce
+ * @param {object} [ctx] the `this` context to set in fn
+ * @param {int} wait number of milliseconds to pause before sending out after each invocation
+ * @param {int} [maxWait] max milliseconds to wait before sending out, defaults to wait * 10 or 100
+ */
+function debounce(fn, ctx, wait, maxWait) {
+  var start, cancelTimer, args, runScheduledForNextTick;
+  if( typeof(ctx) === 'number' ) {
+    maxWait = wait;
+    wait = ctx;
+    ctx = null;
+  }
+
+  if( typeof wait !== 'number' ) {
+    throw new Error('Must provide a valid integer for wait. Try 0 for a default');
+  }
+  if( typeof(fn) !== 'function' ) {
+    throw new Error('Must provide a valid function to debounce');
+  }
+  if( !maxWait ) { maxWait = wait*10 || 100; }
+
+  // clears the current wait timer and creates a new one
+  // however, if maxWait is exceeded, calls runNow() on the next tick.
+  function resetTimer() {
+    if( cancelTimer ) {
+      cancelTimer();
+      cancelTimer = null;
+    }
+    if( start && Date.now() - start > maxWait ) {
+      if(!runScheduledForNextTick){
+        runScheduledForNextTick = true;
+        setTimeout(runNow, 0);
+      }
+    }
+    else {
+      if( !start ) { start = Date.now(); }
+      var to = setTimeout(runNow, wait);
+      cancelTimer = function() { clearTimeout(to); };
+    }
+  }
+
+  // Clears the queue and invokes the debounced function with the most recent arguments
+  function runNow() {
+    cancelTimer = null;
+    start = null;
+    runScheduledForNextTick = false;
+    fn.apply(ctx, args);
+  }
+
+  function debounced() {
+    args = Array.prototype.slice.call(arguments, 0);
+    resetTimer();
+  }
+  debounced.running = function() {
+    return start > 0;
+  };
+
+  return debounced;
+}
+
+function lastKey(list) {
+  var len = list.length;
+  return len? list[len-1] : null;
+}
+
+module.exports = Offset;
+},{"../../common":25}],21:[function(require,module,exports){
+'use strict';
+var util = require('../../common');
+var Cache = require('./Cache');
+
+/**
+ * @param {Firebase} ref
+ * @param {String} field
+ * @param {object} [opts]
+ * @constructor
+ */
+function Paginate(ref, field, opts) {
+  this.currPage = 0;
+  this.field = field;
+  this.ref = ref;
+  this.pageSize = opts.pageSize;
+  this.max = opts.maxCacheSize;
+  this.subs = [];
+  this.pageChangeListeners = [];
+  this.pageCountListeners = [];
+  this.cache = new Cache(ref, field, opts.maxCacheSize);
+  this.pageCount = -1;
+  this.couldHaveMore = false;
+  this.cache.observeHasNext(this._countPages, this);
+}
+
+/**
+ * Unload current records and load the next page into the PaginatedRef
+ *
+ * @return {Paginate} returns `this`
+ */
+Paginate.prototype.next = function() {
+  if( this.hasNext() ) {
+    this.currPage++;
+    util.log.debug('Paginate.next: current page is %d', this.currPage);
+    this._pageChange();
+  }
+  return this;
+};
+
+/**
+ * Unload current records and load the previous page into the PaginatedRef.
+ *
+ * @return {Paginate} returns `this`
+ */
+Paginate.prototype.prev = function() {
+  if( this.hasPrev() ) {
+    this.currPage--;
+    util.log.debug('Paginate.prev: current page is %d', this.currPage);
+    this._pageChange();
+  }
+  return this;
+};
+
+/**
+ * Skip to a specific page. The pageNumber must be less than pageCount.
+ *
+ * @param {int} pageNumber
+ * @return {Paginate} returns `this`
+ */
+Paginate.prototype.setPage = function(pageNumber) {
+  if( pageNumber > 0 && pageNumber <= this.pageCount ) {
+    this.currPage = pageNumber;
+    util.log.debug('Paginate.setPage: current page is %d', this.currPage);
+    this._pageChange();
+  }
+  else {
+    util.log.warn('Paginate.setPage: invalid page number %d', pageNumber);
+  }
+};
+
+/**
+ * @return {boolean} true if there are more records after the currently loaded page
+ */
+Paginate.prototype.hasNext = function() {
+  return this.cache.hasNext();
+};
+
+/**
+ * @return {boolean} true if there are more records before the currently loaded page
+ */
+Paginate.prototype.hasPrev = function() {
+  return this.currPage > 1;
+};
+
+/**
+ * Invoked whenever the page count changes. This may not be accurate if number of pages
+ * exceeds the maxCacheSize.
+ *
+ * The callback is delivered two arguments. The first is the {int} count, and the second
+ * is a {boolean}couldHaveMore which is true whenever we have run into maxCacheSize (i.e. there
+ * could be more)
+ *
+ * @param {Function} callback
+ * @param {Object} [context]
+ * @return {Function} a dispose function that cancels the listener
+ */
+Paginate.prototype.onPageChange = function(callback, context) {
+  var listeners = this.pageChangeListeners;
+  var parts = [callback, context];
+  listeners.push(parts);
+  callback.call(context, this.currPage);
+  return function() {
+    util.remove(listeners, parts);
+  };
+};
+
+/**
+ * Invoked whenever the local page count is changed. This may not include
+ * all records that exist on the remote server, as it is limited by maxCacheSize
+ */
+Paginate.prototype.onPageCount = function(callback, context) {
+  var listeners = this.pageCountListeners;
+  var parts = [callback, context];
+  listeners.push(parts);
+  if( this.pageCount > -1 ) {
+    callback.call(context, this.pageCount, this.couldHaveMore);
+  }
+  else {
+    this._countPages();
+  }
+  return function() {
+    util.remove(listeners, parts);
+  };
+};
+
+/**
+ * Asynchronously fetch the total page count. This maxes a REST API
+ * call using shallow=true. All the keys must be able to fit in memory at the same time.
+ *
+ * @param {Function} [callback]
+ * @param {Object} [context]
+ */
+Paginate.prototype.getCountByDowloadingAllKeys = function(callback, context) {
+  var self = this;
+  self.downloadingEverything = true;
+  var url = self.ref.ref().toString();
+  if( !url.match(/\/$/) ) { url += '/'; }
+  url += '.json?shallow=true';
+  microAjax(url, function(data) {
+    var count = 0;
+    try {
+      count = util.keys(JSON.parse(data)).length;
+    }
+    catch(e) {
+      util.log.warn(e);
+    }
+    util.log.debug('Paginate.getCountByDownloadingAllKeys: found %d keys', count);
+    self.downloadingEverything = false;
+    self.pageCount = countPages(count, self.pageSize);
+    self.couldHaveMore = false;
+    self._notifyPageCount();
+    if( callback ) { callback.call(context, count); }
+  });
+};
+
+/**
+ * Deletes locally cached data and cancels all listeners. Unloads
+ * records and triggers child_removed events.
+ */
+Paginate.prototype.destroy = function() {
+  this.cache.destroy();
+  this.cache = null;
+  this.ref = null;
+  util.each(this.subs, function(fn) { fn(); });
+  this.subs = [];
+  this.pageCountListeners.length = 0;
+  this.pageChangeListeners.length = 0;
+};
+
+Paginate.prototype._countPages = function() {
+  var self = this;
+  var currPage = self.currPage;
+  if( !this.downloadingEverything ) {
+    if( self.pageCount === -1 ) {
+      var max = self.max;
+      var pageSize = self.pageSize;
+      var ref = this.ref.ref().limitToFirst(max);
+      ref.once('value', function(snap) {
+        if( self.pageCount === -1 ) { // double-null check pattern (may have changed during async op)
+          self.couldHaveMore = snap.numChildren() === max;
+          self.pageCount = Math.ceil(snap.numChildren() / pageSize);
+          self._notifyPageCount();
+          self._countPages();
+        }
+      });
+    }
+    else if( currPage >= self.pageCount ) {
+      self.pageCount = currPage;
+      self.couldHaveMore = self.cache.hasNext();
+      self._notifyPageCount();
+    }
+  }
+};
+
+Paginate.prototype._pageChange = function() {
+  var currPage = this.currPage;
+  var start = (currPage -1) * this.pageSize;
+  this.cache.moveTo(start, this.pageSize);
+  this._countPages();
+  util.each(this.pageChangeListeners, function(parts) {
+    parts[0].call(parts[1], currPage);
+  });
+};
+
+Paginate.prototype._notifyPageCount = function() {
+  var pageCount = this.pageCount;
+  var couldHaveMore = this.couldHaveMore;
+  util.each(this.pageCountListeners, function(parts) {
+    parts[0].call(parts[1], pageCount, couldHaveMore);
+  });
+};
+
+function countPages(recordCount, pageSize) {
+  if( recordCount === 0 ) {
+    return 0;
+  }
+  else {
+    return Math.ceil(recordCount / pageSize);
+  }
+}
+
+// https://code.google.com/p/microajax/
+// new BSD license: http://opensource.org/licenses/BSD-3-Clause
+function microAjax(url,callbackFunction){var o={};o.bindFunction=function(caller,object){return function(){return caller.apply(object,[object]);};};o.stateChange=function(object){if(o.request.readyState==4) o.callbackFunction(o.request.responseText);};o.getRequest=function(){if(window.ActiveXObject) return new ActiveXObject('Microsoft.XMLHTTP');else if(window.XMLHttpRequest) return new XMLHttpRequest();return false;};o.postBody=(arguments[2]||"");o.callbackFunction=callbackFunction;o.url=url;o.request=o.getRequest();if(o.request){var req=o.request;req.onreadystatechange=o.bindFunction(o.stateChange,o);if(o.postBody!==""){req.open("POST",url,true);req.setRequestHeader('X-Requested-With','XMLHttpRequest');req.setRequestHeader('Content-type','application/x-www-form-urlencoded');req.setRequestHeader('Connection','close');}else{req.open("GET",url,true);} req.send(o.postBody);} return o;} // jshint ignore:line
+
+module.exports = Paginate;
+
+},{"../../common":25,"./Cache":19}],22:[function(require,module,exports){
+'use strict';
+var util      = require('../../common');
+
+function ReadOnlyRef(ref) {
+  this._ref = ref;
+  this._obs = new util.Observable(
+    ['value', 'child_added', 'child_removed', 'child_moved', 'child_changed']
+  );
+}
+
+
+ReadOnlyRef.prototype = {
+  'on': function(event, callback, cancel, context) {
+    this._obs.observe(event, callback, cancel, context);
+  },
+
+  'once': function(event, callback, cancel, context) {
+    var self = this;
+    function fn(snap) {
+      /*jshint validthis:true */
+      self.off(event, fn, self);
+      callback.call(context, snap);
+    }
+    this.on(event, fn, cancel, this);
+  },
+
+  'off': function(event, callback, context) {
+    this._obs.stopObserving(event, callback, context);
+  },
+
+  /****************************
+   * WRAPPER FUNCTIONS
+   ****************************/
+  'ref': function() {
+    return this._ref;
+  },
+  'child': wrapMaster('child'),
+  'parent': wrapMaster('parent'),
+  'root': wrapMaster('root'),
+  'name': wrapMaster('name'),
+  'key': wrapMaster('key'),
+  'toString': wrapMaster('toString'),
+
+  'auth': wrapMaster('auth'),
+  'unauth': wrapMaster('unauth'),
+  'authWithCustomToken': wrapMaster('authWithCustomToken'),
+  'authAnonymously': wrapMaster('authAnonymously'),
+  'authWithPassword': wrapMaster('authWithPassword'),
+  'authWithOAuthPopup': wrapMaster('authWithOAuthPopup'),
+  'authWithOAuthRedirect': wrapMaster('authWithOAuthRedirect'),
+  'authWithOAuthToken': wrapMaster('authWithOAuthToken'),
+  'getAuth': wrapMaster('getAuth'),
+  'onAuth': wrapMaster('onAuth'),
+  'offAuth': wrapMaster('offAuth'),
+  'createUser': wrapMaster('createUser'),
+  'changePassword': wrapMaster('changePassword'),
+  'removeUser': wrapMaster('removeUser'),
+  'resetPassword': wrapMaster('resetPassword'),
+  'changeEmail': wrapMaster('changeEmail'),
+
+  'goOffline': wrapMaster('goOffline'),
+  'goOnline': wrapMaster('goOnline'),
+
+  /****************************
+   * UNSUPPORTED FUNCTIONS
+   ***************************/
+  'set': isReadOnly('set'),
+  'update': isReadOnly('update'),
+  'remove': isReadOnly('remove'),
+  'push': isReadOnly('push'),
+  'setWithPriority': isReadOnly('setWithPriority'),
+  'setPriority': isReadOnly('setPriority'),
+  'transaction': isReadOnly('transaction'),
+
+  /** @deprecated */
+  'limit': notSupported('limit'),
+
+  'onDisconnect': notSupported('onDisconnect'),
+  'orderByChild': notSupported('orderByChild'),
+  'orderByKey': notSupported('orderByKey'),
+  'orderByPriority': notSupported('orderByPriority'),
+  'limitToFirst': notSupported('limitToFirst'),
+  'limitToLast': notSupported('limitToLast'),
+  'startAt': notSupported('startAt'),
+  'endAt': notSupported('endAt'),
+  'equalTo': notSupported('equalTo'),
+
+  /** INTERNAL METHODS */
+  $trigger: function() {
+    this._obs.triggerEvent.apply(this._obs, util.toArray(arguments));
+  }
+};
+
+function wrapMaster(method) {
+  return function() {
+    var args = util.toArray(arguments);
+    var ref = this.ref();
+    return ref[method].apply(ref, args);
+  };
+}
+
+function isReadOnly(method) {
+  return function() {
+    throw new Error(method + ' is not supported. This is a read-only reference. You can ' +
+    'modify child records after calling .child(), or work with the original by using .ref().');
+  };
+}
+
+function notSupported(method) {
+  return function() {
+    throw new Error(method + ' is not supported for Paginate and Scroll references. ' +
+    'Try calling it on the original reference used to create the instance instead.');
+  };
+}
+
+module.exports = ReadOnlyRef;
+},{"../../common":25}],23:[function(require,module,exports){
+'use strict';
+var Cache = require('./Cache');
+
+/**
+ * @param {ReadOnlyRef} readOnlyRef
+ * @param {String} field
+ * @param {Object} [opts]
+ * @constructor
+ */
+function Scroll(readOnlyRef, field, opts, desc) {
+  this.max = opts.windowSize;
+  this.start = 0;
+  this.end = 0;
+  this.cache = new Cache(readOnlyRef, field, opts.maxCacheSize, desc);
+}
+
+/**
+ * Load the next numberToAppend records and trigger child_added events
+ * for them. If the total number of records exceeds maxRecords, then
+ * child_removed events will be triggered for the first items in the list.
+ *
+ * @param {int} numberToAppend
+ */
+Scroll.prototype.next = function(numberToAppend) {
+  if( this.hasNext() ) {
+    this.end = this.end + numberToAppend;
+    this.start = Math.max(0, this.end - this.max, this.start);
+    this.cache.moveTo(this.start, this.end - this.start);
+  }
+};
+
+/**
+ * Load the previous numberToAppend records and trigger child_added events
+ * for them. If the total number of records exceeds maxRecords, then
+ * child_removed events will be triggered for the last items in the list.
+ *
+ * @param {int} numberToPrepend
+ */
+Scroll.prototype.prev = function(numberToPrepend) {
+  if( this.hasPrev() ) {
+    this.start = Math.max(0, this.start - numberToPrepend);
+    this.end = Math.min(this.start + this.max, this.end);
+    this.cache.moveTo(this.start, this.end-this.start);
+  }
+};
+
+/**
+ * @return {boolean} true if there are more records after the currently loaded page
+ */
+Scroll.prototype.hasNext = function() {
+  return this.cache.hasNext();
+};
+
+/**
+ * @return {boolean} true if there are more records before the currently loaded page
+ */
+Scroll.prototype.hasPrev = function() {
+  return this.start > 0;
+};
+
+Scroll.prototype.observeHasNext = function(callback, context) {
+  return this.cache.observeHasNext(callback, context);
+};
+
+/**
+ * Deletes locally cached data and cancels all listeners. Unloads
+ * records and triggers child_removed events.
+ */
+Scroll.prototype.destroy = function() {
+  this.cache.destroy();
+  this.ref = null;
+  this.cache = null;
+};
+
+module.exports = Scroll;
+},{"./Cache":19}],24:[function(require,module,exports){
+/**
+ * This file loads all the public methods from
+ * the common/ library. To fetch all methods
+ * for internal use, just do require('./src/common'),
+ * which loads index.js and includes the private methods.
+ */
+
+var util = require('./index.js');
+exports.log = util.log;
+exports.logLevel = util.logLevel;
+exports.escapeEmail = util.escapeEmail;
+},{"./index.js":25}],25:[function(require,module,exports){
+/**
+ * This file loads the entire common/ package for INTERNAL USE.
+ * The public methods are specified by exports.js
+ */
+
+var util = require('./libs/util.js');
+var log = require('./libs/logger.js');
+
+util.extend(
+  exports,
+  util,
+  {
+    args: require('./libs/args.js'),
+    log: log,
+    logLevel: log.logLevel,
+    Observable: require('./libs/Observable.js'),
+    Observer: require('./libs/Observer.js'),
+    queue: require('./libs/queue.js')
+  }
+);
+},{"./libs/Observable.js":26,"./libs/Observer.js":27,"./libs/args.js":28,"./libs/logger.js":29,"./libs/queue.js":30,"./libs/util.js":31}],26:[function(require,module,exports){
+'use strict';
+
+var util = require('./util.js');
+var getArgs = require('./args.js');
+var log = require('./logger.js');
+var Observer = require('./Observer.js');
+
+/**
+ * A simple observer model for watching events.
+ * @param eventsMonitored
+ * @param [opts] can contain callbacks for onAdd, onRemove, and onEvent, as well as a list of oneTimeEvents
+ * @constructor
+ */
+function Observable(eventsMonitored, opts) {
+  if( !opts ) { opts = {}; }
+  this._observableProps = parseProps(eventsMonitored, opts);
+  this.resetObservers();
+}
+Observable.prototype = {
+  /**
+   * @param {String} event
+   * @param {Function|util.Observer} callback
+   * @param {Function} [cancelFn]
+   * @param {Object} [scope]
+   */
+  observe: function(event, callback, cancelFn, scope) {
+    var args = getArgs('observe', arguments, 2, 4), obs;
+    event = args.nextFromReq(this._observableProps.eventsMonitored);
+    if( event ) {
+      callback = args.nextReq('function');
+      cancelFn = args.next('function');
+      scope = args.next('object');
+      obs = new Observer(this, event, callback, scope, cancelFn);
+      this._observableProps.observers[event].push(obs);
+      this._observableProps.onAdd(event, obs);
+      if( this.isOneTimeEvent(event) ) {
+        checkOneTimeEvents(event, this._observableProps, obs);
+      }
+    }
+    return obs;
+  },
+
+  /**
+   * @param {String|Array} [event]
+   * @returns {boolean}
+   */
+  hasObservers: function(event) {
+    return this.getObservers(event).length > 0;
+  },
+
+  /**
+   * @param {String|Array} events
+   * @param {Function|Observer} callback
+   * @param {Object} [scope]
+   */
+  stopObserving: function(events, callback, scope) {
+    var args = getArgs('stopObserving', arguments);
+    events = args.next(['array', 'string'], this._observableProps.eventsMonitored);
+    callback = args.next(['function']);
+    scope = args.next(['object']);
+    util.each(events, function(event) {
+      var removes = [];
+      var observers = this.getObservers(event);
+      util.each(observers, function(obs) {
+        if( obs.matches(event, callback, scope) ) {
+          obs.notifyCancelled(null);
+          removes.push(obs);
+        }
+      }, this);
+      removeAll(this._observableProps.observers[event], removes);
+      if( removes.length ) {
+        this._observableProps.onRemove(event, removes);
+      }
+    }, this);
+  },
+
+  /**
+   * Turn off all observers and call cancel callbacks with an error
+   * @param {String} error
+   * @returns {*}
+   */
+  abortObservers: function(error) {
+    var removes = [];
+    if( this.hasObservers() ) {
+      var observers = this.getObservers().slice();
+      util.each(observers, function(obs) {
+        obs.notifyCancelled(error);
+        removes.push(obs);
+      }, this);
+      this.resetObservers();
+      if( removes.length ) {
+        this._observableProps.onRemove(this.event, removes);
+      }
+    }
+  },
+
+  /**
+   * @param {String|Array} [events]
+   * @returns {*}
+   */
+  getObservers: function(events) {
+    events = getArgs('getObservers', arguments).listFrom(this._observableProps.eventsMonitored, true);
+    return getObserversFor(this._observableProps, events);
+  },
+
+  triggerEvent: function(event) {
+    var args = getArgs('triggerEvent', arguments);
+    var events = args.listFromWarn(this._observableProps.eventsMonitored, true);
+    var passThruArgs = args.restAsList();
+    if( events ) {
+      util.each(events, function(e) {
+        if( this.isOneTimeEvent(event) ) {
+          if( util.isArray(this._observableProps.oneTimeResults, event) ) {
+            log.warn('One time event was triggered twice, should by definition be triggered once', event);
+            return;
+          }
+          this._observableProps.oneTimeResults[event] = passThruArgs;
+        }
+        var observers = this.getObservers(e), ct = 0;
+        util.each(observers, function(obs) {
+          obs.notify.apply(obs, passThruArgs.slice(0));
+          ct++;
+        });
+        this._observableProps.onEvent.apply(null, [e, ct].concat(passThruArgs.slice(0)));
+      }, this);
+    }
+  },
+
+  resetObservers: function() {
+    util.each(this._observableProps.eventsMonitored, function(key) {
+      this._observableProps.observers[key] = [];
+    }, this);
+  },
+
+  isOneTimeEvent: function(event) {
+    return util.contains(this._observableProps.oneTimeEvents, event);
+  },
+
+  observeOnce: function(event, callback, cancelFn, scope) {
+    var args = getArgs('observeOnce', arguments, 2, 4), obs;
+    event = args.nextFromWarn(this._observableProps.eventsMonitored);
+    if( event ) {
+      callback = args.nextReq('function');
+      cancelFn = args.next('function');
+      scope = args.next('object');
+      obs = new Observer(this, event, callback, scope, cancelFn, true);
+      this._observableProps.observers[event].push(obs);
+      this._observableProps.onAdd(event, obs);
+      if( this.isOneTimeEvent(event) ) {
+        checkOneTimeEvents(event, this._observableProps, obs);
+      }
+    }
+    return obs;
+  }
+};
+
+function removeAll(list, items) {
+  util.each(items, function(x) {
+    var i = util.indexOf(list, x);
+    if( i >= 0 ) {
+      list.splice(i, 1);
+    }
+  });
+}
+
+function getObserversFor(props, events) {
+  var out = [];
+  util.each(events, function(event) {
+    if( !util.has(props.observers, event) ) {
+      log.warn('Observable.hasObservers: invalid event type %s', event);
+    }
+    else {
+      if( props.observers[event].length ) {
+        out = out.concat(props.observers[event]);
+      }
+    }
+  });
+  return out;
+}
+
+function checkOneTimeEvents(event, props, obs) {
+  if( util.has(props.oneTimeResults, event) ) {
+    obs.notify.apply(obs, props.oneTimeResults[event]);
+  }
+}
+
+function parseProps(eventsMonitored, opts) {
+  return util.extend(
+    { onAdd: util.noop, onRemove: util.noop, onEvent: util.noop, oneTimeEvents: [] },
+    opts,
+    { eventsMonitored: eventsMonitored, observers: {}, oneTimeResults: {} }
+  );
+}
+
+module.exports = Observable;
+},{"./Observer.js":27,"./args.js":28,"./logger.js":29,"./util.js":31}],27:[function(require,module,exports){
+'use strict';
+var util = require('./util.js');
+
+/** Observer
+ ***************************************************
+ * @private
+ * @constructor
+ */
+function Observer(observable, event, notifyFn, context, cancelFn, oneTimeEvent) {
+  if( typeof(notifyFn) !== 'function' ) {
+    throw new Error('Must provide a valid notifyFn');
+  }
+  this.observable = observable;
+  this.fn = notifyFn;
+  this.event = event;
+  this.cancelFn = cancelFn||function() {};
+  this.context = context;
+  this.oneTimeEvent = !!oneTimeEvent;
+}
+
+Observer.prototype = {
+  notify: function() {
+    var args = util.toArray(arguments);
+    this.fn.apply(this.context, args);
+    if( this.oneTimeEvent ) {
+      this.observable.stopObserving(this.event, this.fn, this.context);
+    }
+  },
+
+  matches: function(event, fn, context) {
+    if( util.isArray(event) ) {
+      return util.contains(event, function(e) {
+        return this.matches(e, fn, context);
+      }, this);
+    }
+    return (!event || event === this.event) &&
+      (!fn || fn === this || fn === this.fn) &&
+      (!context || context === this.context);
+  },
+
+  notifyCancelled: function(err) {
+    this.cancelFn.call(this.context, err||null);
+  }
+};
+
+module.exports = Observer;
+},{"./util.js":31}],28:[function(require,module,exports){
+'use strict';
+var util = require('./util.js');
+var log = require('./logger.js');
+
+function Args(fnName, args, minArgs, maxArgs) {
+  if( typeof(fnName) !== 'string' || !util.isObject(args) ) {
+    throw new Error('Args requires at least 2 args: fnName, arguments[, minArgs, maxArgs]');
+  }
+  if( !(this instanceof Args) ) { // allow it to be called without `new` prefix
+    return new Args(fnName, args, minArgs, maxArgs);
+  }
+  this.fnName = fnName;
+  this.argList = util.toArray(args);
+  this.origArgs = util.toArray(args);
+  var len = this.length = this.argList.length;
+  this.pos = -1;
+  if(util.isUndefined(minArgs)) { minArgs = 0; }
+  if(util.isUndefined(maxArgs)) { maxArgs = this.argList.length; }
+  if( len < minArgs || len > maxArgs ) {
+    var rangeText = maxArgs > minArgs? util.printf('%d to %d', minArgs, maxArgs) : minArgs;
+    throw Error(util.printf('%s must be called with %s arguments, but received %d', fnName, rangeText, len));
+  }
+}
+
+Args.prototype = {
+  /**
+   * Grab the original list of args
+   * @return {Array} containing the original arguments
+   */
+  orig: function() { return this.origArgs.slice(0); },
+
+  /**
+   * Return whatever args remain as a list
+   * @returns {Array|string|Buffer|Blob|*}
+   */
+  restAsList: function(minLength, types) {
+    var list = this.argList.slice(0);
+    if( minLength || types ) {
+      for (var i = 0, len = list.length; i < len; i++) {
+        this._arg(types||true, null, i < minLength);
+      }
+    }
+    return list;
+  },
+
+  /**
+   * Advance the argument list by one and discard the value
+   * @return {Args}
+   */
+  skip: function() {
+    if( this.argList.length ) {
+      this.pos++;
+      this.argList.shift();
+    }
+    return this;
+  },
+
+  /**
+   * Read the next optional argument, but only if `types` is true, or it is of a type specified
+   * In the case that it is not present, return `defaultValue`
+   * @param {boolean|Array|string} types either `true` or one of array, string, object, number, int, boolean, boolean-like, or function
+   * @param [defaultValue]
+   */
+  next: function(types, defaultValue) {
+    return this._arg(types, defaultValue, false);
+  },
+
+  /**
+   * Read the next optional argument, but only if `types` is true, or it is of a type specified. In the case
+   * that it is not present, return `defaultValue` and log a warning to the console
+   * @param {boolean|Array|string} types either `true` or one of array, string, object, number, int, boolean, boolean-like, or function
+   * @param [defaultValue]
+   */
+  nextWarn: function(types, defaultValue) {
+    return this._arg(types, defaultValue, 'warn');
+  },
+
+  /**
+   * Read the next required argument, but only if `types` is true, or it is of a type specified. In the case
+   * that it is not present, throw an Error
+   * @param {boolean|Array|string} types either `true` or one of array, string, object, number, int, boolean, boolean-like, or function
+   */
+  nextReq: function(types) {
+    return this._arg(types, null, true);
+  },
+
+  /**
+   * Read the next optional argument, which must be one of the values in choices. If it is not present,
+   * return defaultValue.
+   * @param {Array} choices a list of allowed values
+   * @param [defaultValue]
+   */
+  nextFrom: function(choices, defaultValue) {
+    return this._from(choices, defaultValue, false);
+  },
+
+  /**
+   * Read the next optional argument, which must be one of the values in choices. If it is not present,
+   * return defaultValue and log a warning to the console.
+   * @param {Array} choices a list of allowed values
+   * @param [defaultValue]
+   */
+  nextFromWarn: function(choices, defaultValue) {
+    return this._from(choices, defaultValue, 'warn');
+  },
+
+  /**
+   * Read the next optional argument, which must be one of the values in choices. If it is not present,
+   * throw an Error.
+   * @param {Array} choices a list of allowed values
+   */
+  nextFromReq: function(choices) {
+    return this._from(choices, null, true);
+  },
+
+  /**
+   * Read the next optional argument and return it as an array (it can optionally be an array or a single value
+   * which will be coerced into an array). All values in the argument must be in choices or they are removed
+   * from the choices and a warning is logged. If no valid value is present, return defaultValue.
+   * @param {Array} choices a list of allowed values
+   * @param [defaultValue] a set of defaults, setting this to true uses the `choices` as default
+   */
+  listFrom: function(choices, defaultValue) {
+    return this._list(choices, defaultValue, false);
+  },
+
+  /**
+   * Read the next optional argument and return it as an array (it can optionally be an array or a single value
+   * which will be coerced into an array). All values in the argument must be in choices or they are removed
+   * from the choices and a warning is logged. If no valid value is present, return defaultValue and log a warning.
+   * @param {Array} choices a list of allowed values
+   * @param [defaultValue] a set of defaults, setting this to true uses the `choices` as default
+   */
+  listFromWarn: function(choices, defaultValue) {
+    return this._list(choices, defaultValue, 'warn');
+  },
+
+  /**
+   * Read the next optional argument and return it as an array (it can optionally be an array or a single value
+   * which will be coerced into an array). All values in the argument must be in choices or they are removed
+   * from the choices and a warning is logged. If no valid value is present, throw an Error.
+   * @param {Array} choices a list of allowed values
+   */
+  listFromReq: function(choices) {
+    return this._list(choices, null, true);
+  },
+
+  _arg: function(types, defaultValue, required) {
+    this.pos++;
+    if( util.isUndefined(types) || types === null ) { types = true; }
+    if( this.argList.length && isOfType(this.argList[0], types) ) {
+      return format(this.argList.shift(), types);
+    }
+    else {
+      if( required ) {
+        assertRequired(required, this.fnName, this.pos, util.printf('must be of type %s', types));
+      }
+      return defaultValue;
+    }
+  },
+
+  _from: function(choices, defaultValue, required) {
+    this.pos++;
+    if( this.argList.length && util.contains(choices, this.argList[0]) ) {
+      return this.argList.shift();
+    }
+    else {
+      if( required ) {
+        assertRequired(required, this.fnName, this.pos, util.printf('must be one of %s', choices));
+      }
+      return defaultValue;
+    }
+  },
+
+  _list: function(choices, defaultValue, required) {
+    this.pos++;
+    var out = [];
+    var list = this.argList[0];
+    if( this.argList.length && !util.isEmpty(list) && (util.isArray(list) || !util.isObject(list)) ) {
+      this.argList.shift();
+      if( util.isArray(list) ) {
+        out = util.map(list, function(v) {
+          if( util.contains(choices, v) ) {
+            return v;
+          }
+          else {
+            badChoiceWarning(this.fnName, v, choices);
+            return undefined;
+          }
+        }, this);
+      }
+      else {
+        if( util.contains(choices, list) ) {
+          out = [list];
+        }
+        else {
+          badChoiceWarning(this.fnName, list, choices);
+        }
+      }
+    }
+    if( util.isEmpty(out) ) {
+      if( required ) {
+        assertRequired(required, this.fnName, this.pos,
+          util.printf('choices must be in [%s]', choices));
+      }
+      return defaultValue === true? choices : defaultValue;
+    }
+    return out;
+  }
+
+};
+
+function isOfType(val, types) {
+  if( types === true ) { return true; }
+  if( !util.isArray(types) ) { types = [types]; }
+  return util.contains(types, function(type) {
+    switch(type) {
+      case 'array':
+        return util.isArray(val);
+      case 'string':
+        return typeof(val) === 'string';
+      case 'number':
+        return isFinite(parseInt(val, 10));
+      case 'int':
+      case 'integer':
+        return isFinite(parseFloat(val));
+      case 'object':
+        return util.isObject(val);
+      case 'function':
+        return typeof(val) === 'function';
+      case 'bool':
+      case 'boolean':
+        return typeof(val) === 'boolean';
+      case 'boolean-like':
+        return !util.isObject(val); // be lenient here
+      default:
+        throw new Error('Args received an invalid data type: '+type);
+    }
+  });
+}
+
+function assertRequired(required, fnName, pos, msg) {
+  msg = util.printf('%s: invalid argument at pos %d, %s (received %s)', fnName, pos, msg);
+  if( required === true ) {
+    throw new Error(msg);
+  }
+  else if( util.has(log, required) ) {
+    log[required](msg);
+  }
+  else {
+    throw new Error('The `required` value passed to Args methods must either be true or a method name from logger');
+  }
+}
+
+function badChoiceWarning(fnName, val, choices) {
+  log.warn('%s: invalid choice %s, must be one of [%s]', fnName, val, choices);
+}
+
+function format(val, types) {
+  if( types === true ) { return val; }
+  var type = util.isArray(types)? types[0] : types;
+  switch(type) {
+    case 'array':
+      return util.isArray(val)? val : [val];
+    case 'string':
+      return val + '';
+    case 'number':
+      return parseFloat(val);
+    case 'int':
+    case 'integer':
+      return parseInt(val, 10);
+    case 'bool':
+    case 'boolean':
+    case 'boolean-like':
+      return !!val;
+    case 'function':
+    case 'object':
+      return val;
+    default:
+      throw new Error('Args received an invalid data type: '+type);
+  }
+}
+
+module.exports = Args;
+},{"./logger.js":29,"./util.js":31}],29:[function(require,module,exports){
+'use strict';
+/*global window*/
+var DEFAULT_LEVEL = 2; //  errors and warnings
+var oldDebuggingLevel = false;
+var fakeConsole = {
+  error: noop, warn: noop, info: noop, log: noop, debug: noop, time: noop, timeEnd: noop, group: noop, groupEnd: noop
+};
+var util = require('./util.js');
+
+var logger = function() {
+  logger.log.apply(null, util.toArray(arguments));
+};
+
+/** hints for the IDEs */
+logger.warn = noop;
+logger.error = noop;
+logger.info = noop;
+logger.log = noop;
+logger.debug = noop;
+logger.isErrorEnabled = noop;
+logger.isWarnEnabled = noop;
+logger.isInfoEnabled = noop;
+logger.isLogEnabled = noop;
+logger.isDebugEnabled = noop;
+
+/**
+ * @param {int} level use -1 to turn off all logging, use 5 for maximum debugging
+ * @param {string|RegExp} [grep] filter logs to those whose first value matches this text or expression
+ */
+logger.logLevel = function(level, grep) {
+  if( typeof(level) !== 'number' ) { level = levelInt(level); }
+
+  if( oldDebuggingLevel === level ) { return function() {}; }
+
+  util.each(['error', 'warn', 'info', 'log', 'debug'], function(k, i) {
+    var isEnabled = typeof(console) !== 'undefined' && level >= i+1;
+    if( isEnabled ) {
+      // binding is necessary to prevent IE 8/9 from having a spaz when
+      // .apply and .call are used on console methods
+      var fn = util.bind(console[k==='debug'? 'log' : k], console);
+      logger[k] = function() {
+        var args = util.toArray(arguments);
+        if( args.length > 1 && typeof args[0] === 'string' ) {
+          var m = args[0].match(/(%s|%d|%j)/g);
+          if( m ) {
+            var newArgs = [util.printf.apply(util, args)];
+            args = args.length > m.length+1? newArgs.concat(args.slice(m.length+1)) : newArgs;
+          }
+        }
+        if( !grep || !filterThis(grep, args) ) {
+          fn.apply(typeof(console) === 'undefined'? fakeConsole : console, args);
+        }
+      };
+    }
+    else {
+      logger[k] = noop;
+    }
+    logger['is' + ucfirst(k) + 'Enabled'] = function() { return isEnabled; };
+  });
+
+  // provide a way to revert the debugging level if I want to change it temporarily
+  var off = (function(x) {
+    return function() { logger.logLevel(x); };
+  })(oldDebuggingLevel);
+  oldDebuggingLevel = level;
+
+  return off;
+};
+
+function ucfirst(s) {
+  return s.charAt(0).toUpperCase() + s.substr(1);
+}
+
+function getDefaultLevel() {
+  var m;
+  if( typeof(window) !== 'undefined' && window.location && window.location.search ) {
+    m = window.location.search.match('\bdebugLevel=([0-9]+)\b');
+  }
+  return m? parseInt(m[1], 10) : DEFAULT_LEVEL;
+}
+
+function noop() { return true; }
+
+function filterThis(expr, args) {
+  if( !args.length ) {
+    return true;
+  }
+  else if( expr instanceof RegExp ) {
+    return !expr.test(args[0]+'');
+  }
+  else {
+    return !(args[0]+'').match(expr);
+  }
+}
+
+function levelInt(x) {
+  switch(x) {
+    case false: return 0;
+    case 'off': return 0;
+    case 'none': return 0;
+    case 'error': return 1;
+    case 'warn': return 2;
+    case 'warning': return 2;
+    case 'info': return 3;
+    case 'log': return 4;
+    case 'debug': return 5;
+    case true: return DEFAULT_LEVEL;
+    case 'on': return DEFAULT_LEVEL;
+    case 'all': return DEFAULT_LEVEL;
+    default: return DEFAULT_LEVEL;
+  }
+}
+
+logger.logLevel(getDefaultLevel());
+module.exports = logger;
+},{"./util.js":31}],30:[function(require,module,exports){
+'use strict';
+var util = require('./util.js');
+
+function Queue(criteriaFunctions) {
+  this.needs = 0;
+  this.met = 0;
+  this.queued = [];
+  this.errors = [];
+  this.criteria = [];
+  this.processing = false;
+  util.each(criteriaFunctions, this.addCriteria, this);
+}
+
+Queue.prototype = {
+  /**
+   * @param {Function} criteriaFn
+   * @param {Object} [scope]
+   */
+  addCriteria: function(criteriaFn, scope) {
+    if( this.processing ) {
+      throw new Error('Cannot call addCriteria() after invoking done(), fail(), or handler() methods');
+    }
+    this.criteria.push(scope? [criteriaFn, scope] : criteriaFn);
+    return this;
+  },
+
+  /**
+   * Returns a node-like callback to be invoked when an op is completed.
+   * @returns {function}
+   */
+  getHandler: function() {
+    var doneCallback, result;
+    this.addCriteria(function(done) {
+      if( result !== util.undef ) {
+        done(result);
+      }
+      else {
+        doneCallback = done;
+      }
+    });
+    return function(err) {
+      if( doneCallback ) { doneCallback(err); }
+      else { result = err; }
+    };
+  },
+
+  ready: function() {
+    return this.needs === this.met;
+  },
+
+  done: function(fn, context) {
+    if( fn ) {
+      this._runOrStore(function() {
+        if( !this.hasErrors() ) { fn.call(context); }
+      });
+    }
+    return this;
+  },
+
+  fail: function(fn, context) {
+    this._runOrStore(function() {
+      if( this.hasErrors() ) { fn.apply(context, this.getErrors()); }
+    });
+    return this;
+  },
+
+  handler: function(fn, context) {
+    this._runOrStore(function() {
+      fn.apply(context, this.getErrors());
+    });
+    return this;
+  },
+
+  /**
+   * @param {Queue} queue
+   */
+  chain: function(queue) {
+    this.addCriteria(queue.handler, queue);
+    return this;
+  },
+
+  when: function(def) {
+    this._runOrStore(function() {
+      if( this.hasErrors() ) {
+        def.reject.apply(def, this.getErrors());
+      }
+      else {
+        def.resolve();
+      }
+    });
+  },
+
+  addError: function(e) {
+    this.errors.push(e);
+  },
+
+  hasErrors: function() {
+    return this.errors.length;
+  },
+
+  getErrors: function() {
+    return this.errors.slice(0);
+  },
+
+  _process: function() {
+    this.processing = true;
+    this.needs = this.criteria.length;
+    util.each(this.criteria, this._evaluateCriteria, this);
+  },
+
+  _evaluateCriteria: function(criteriaFn) {
+    var scope = null;
+    if( util.isArray(criteriaFn) ) {
+      scope = criteriaFn[1];
+      criteriaFn = criteriaFn[0];
+    }
+    try {
+      criteriaFn.call(scope, util.bind(this._criteriaMet, this));
+    }
+    catch(e) {
+      this.addError(e);
+    }
+  },
+
+  _criteriaMet: function(error) {
+    if( error ) { this.addError(error); }
+    this.met++;
+    if( this.ready() ) {
+      util.each(this.queued, this._run, this);
+    }
+  },
+
+  _runOrStore: function(fn) {
+    if( !this.processing ) { this._process(); }
+    if( this.ready() ) {
+      this._run(fn);
+    }
+    else {
+      this.queued.push(fn);
+    }
+  },
+
+  _run: function(fn) {
+    fn.call(this);
+  }
+};
+
+module.exports = function(criteriaFns, callback) {
+  var q = new Queue(criteriaFns);
+  if( callback ) { q.done(callback); }
+  return q;
+};
+
+},{"./util.js":31}],31:[function(require,module,exports){
+(function (global){
+/*jshint unused:vars */
+/*jshint bitwise:false */
+
+'use strict';
+
+var undef;
+var util = exports;
+var READ_EVENTS = ['value', 'child_added', 'child_removed', 'child_updated', 'child_changed'];
+
+util.undef = undef;
+util.Firebase = global.Firebase || require('firebase');
+
+util.isDefined = function(v) {
+  return v !== undef;
+};
+
+util.isUndefined = function(v) {
+  return v === undef;
+};
+
+util.isObject = function(v) {
+  return Object.prototype.isPrototypeOf(v);
+};
+
+util.isArray = function(v) {
+  return (Array.isArray || isArray).call(null, v);
+};
+
+util.isArrayLike = function(v) {
+  return util.isArray(v) || isArguments(v);
+};
+
+/**
+ * @param v value to test or if `key` is provided, the object containing method
+ * @param {string} [key] if provided, v is an object and this is the method we want to find
+ * @returns {*}
+ */
+util.isFunction = function(v, key) {
+  if( typeof(key) === 'string' ) {
+    return util.isObject(v) && util.has(v, key) && typeof(v[key]) === 'function';
+  }
+  else {
+    return typeof(v) === 'function';
+  }
+};
+
+util.toArray = function(vals, startFrom) {
+  var newVals = util.map(vals, function(v, k) { return v; });
+  return startFrom > 0? newVals.slice(startFrom) : newVals;
+};
+
+/**
+ * @param {boolean} [recursive] if true, keys are merged recursively, otherwise, they replace the base
+ * @param {...object} base
+ * @returns {Object}
+ */
+util.extend = function(recursive, base) {
+  var args = util.toArray(arguments);
+  var recurse = typeof args[0] === 'boolean' && args.shift();
+  var out = args.shift();
+  util.each(args, function(o) {
+    if( util.isObject(o) ) {
+      util.each(o, function(v,k) {
+        out[k] = recurse && util.isObject(out[k])? util.extend(true, out[k], v) : v;
+      });
+    }
+  });
+  return out;
+};
+
+util.bind = function(fn, scope) {
+  var args = Array.prototype.slice.call(arguments, 1);
+  return (fn.bind || bind).apply(fn, args);
+};
+
+/**
+ * @param {Object|Array} vals
+ * @returns {boolean}
+ */
+util.isEmpty = function(vals) {
+  return vals === undef || vals === null ||
+    (util.isArrayLike(vals) && vals.length === 0) ||
+    (util.isObject(vals) && !util.contains(vals, function(v) { return true; }));
+};
+
+/**
+ * @param {Object|Array} vals
+ * @returns {Array} of keys
+ */
+util.keys = function(vals) {
+  var keys = [];
+  util.each(vals, function(v, k) { keys.push(k); });
+  return keys;
+};
+
+/**
+ * Create an array using values returned by an iterator. Undefined values
+ * are discarded.
+ *
+ * @param vals
+ * @param iterator
+ * @param [scope]
+ * @returns {*}
+ */
+util.map = function(vals, iterator, scope) {
+  var out = [];
+  util.each(vals, function(v, k) {
+    var res = iterator.call(scope, v, k, vals);
+    if( res !== undef ) { out.push(res); }
+  });
+  return out;
+};
+
+/**
+ *
+ * @param {Object} list
+ * @param {Function} iterator
+ * @param {Object} [scope]
+ */
+util.mapObject = function(list, iterator, scope) {
+  var out = {};
+  util.each(list, function(v,k) {
+    var res = iterator.call(scope, v, k, list);
+    if( res !== undef ) {
+      out[k] = res;
+    }
+  });
+  return out;
+};
+
+/**
+ * Returns the first match
+ * @param {Object|Array} vals
+ * @param {Function} iterator
+ * @param {Object} [scope] set `this` in the callback or undefined
+ */
+util.find = function(vals, iterator, scope) {
+  if( util.isArrayLike(vals) ) {
+    for(var i = 0, len = vals.length; i < len; i++) {
+      if( iterator.call(scope, vals[i], i, vals) === true ) { return vals[i]; }
+    }
+  }
+  else if( util.isObject(vals) ) {
+    var key;
+    for (key in vals) {
+      if (vals.hasOwnProperty(key) && iterator.call(scope, vals[key], key, vals) === true) {
+        return vals[key];
+      }
+    }
+  }
+  return undef;
+};
+
+util.filter = function(list, iterator, scope) {
+  var isArray = util.isArrayLike(list);
+  var out = isArray? [] : {};
+  util.each(list, function(v,k) {
+    if( iterator.call(scope, v, k, list) ) {
+      if( isArray ) {
+        out.push(v);
+      }
+      else {
+        out[k] = v;
+      }
+    }
+  });
+  return out;
+};
+
+util.reduce = function(list, accumulator, iterator) {
+  util.each(list, function(v, k) {
+    accumulator = iterator(accumulator, v, k, list);
+  });
+  return accumulator;
+};
+
+util.has = function(vals, key) {
+  return util.isObject(vals) && vals[key] !== undef;
+};
+
+util.val = function(list, key) {
+  return util.has(list, key)? list[key] : undef;
+};
+
+util.contains = function(vals, iterator, scope) {
+  if( typeof(iterator) !== 'function' ) {
+    if( util.isArray(vals) ) {
+      return util.indexOf(vals, iterator) > -1;
+    }
+    iterator = (function(testVal) {
+      return function(v) { return v === testVal; };
+    })(iterator);
+  }
+  return util.find(vals, iterator, scope) !== undef;
+};
+
+util.each = function(vals, cb, scope) {
+  if( util.isArrayLike(vals) ) {
+    (vals.forEach || forEach).call(vals, cb, scope);
+  }
+  else if( util.isObject(vals) ) {
+    var key;
+    for (key in vals) {
+      if (vals.hasOwnProperty(key)) {
+        cb.call(scope, vals[key], key, vals);
+      }
+    }
+  }
+};
+
+util.indexOf = function(list, item) {
+  return (list.indexOf || indexOf).call(list, item);
+};
+
+util.remove = function(list, item) {
+  var res = false;
+  if( util.isArray(list) ) {
+    var i = util.indexOf(list, item);
+    if( i > -1 ) {
+      list.splice(i, 1);
+      res = true;
+    }
+  }
+  else if( util.isObject(list) ) {
+    var key;
+    for (key in list) {
+      if (list.hasOwnProperty(key) && item === list[key]) {
+        res = true;
+        delete list[key];
+        break;
+      }
+    }
+  }
+  return res;
+};
+
+/**
+ * Invoke a function after a setTimeout(..., 0), to help convert synch callbacks to async ones.
+ * Additional args after `scope` will be passed to the fn when it is invoked
+ *
+ * @param {Function} fn
+ * @param {Object} scope the `this` scope inside `fn`
+ */
+util.defer = function(fn, scope) {
+  var args = util.toArray(arguments);
+  setTimeout(util.bind.apply(null, args), 0);
+};
+
+/**
+ * Call a method on each instance contained in the list. Any additional args are passed into the method.
+ *
+ * @param {Object|Array} list contains instantiated objects
+ * @param {String} methodName
+ * @return {Array}
+ */
+util.call = function(list, methodName) {
+  var args = util.toArray(arguments, 2);
+  var res = [];
+  util.each(list, function(o) {
+    if( typeof(o) === 'function' && !methodName ) {
+      return res.push(o.apply(null, args));
+    }
+    if( util.isObject(o) && typeof(o[methodName]) === 'function' ) {
+      res.push(o[methodName].apply(o, args));
+    }
+  });
+  return res;
+};
+
+/**
+ * Determine if two variables are equal. They must be:
+ *  - of the same type
+ *  - arrays must be same length and all values pass isEqual()
+ *  - arrays must be in same order
+ *  - objects must contain the same keys and their values pass isEqual()
+ *  - object keys do not have to be in same order unless objectsSameOrder === true
+ *  - primitives must pass ===
+ *
+ * @param a
+ * @param b
+ * @param {boolean} [objectsSameOrder]
+ * @returns {boolean}
+ */
+util.isEqual = function(a, b, objectsSameOrder) {
+  if( a === b ) { return true; }
+  else if( typeof(a) !== typeof(b) ) {
+    return false;
+  }
+  else if( util.isObject(a) && util.isObject(b) ) {
+    var isA = util.isArrayLike(a);
+    var isB = util.isArrayLike(b);
+    if( isA || isB ) {
+      return isA && isB && a.length === b.length && !util.contains(a, function(v, i) {
+        return !util.isEqual(v, b[i]);
+      });
+    }
+    else {
+      var aKeys = objectsSameOrder? util.keys(a) : util.keys(a).sort();
+      var bKeys = objectsSameOrder? util.keys(b) : util.keys(b).sort();
+      return util.isEqual(aKeys, bKeys) &&
+        !util.contains(a, function(v, k) { return !util.isEqual(v, b[k]); });
+    }
+  }
+  else {
+    return false;
+  }
+};
+
+util.bindAll = function(context, methods) {
+  util.each(methods, function(m,k) {
+    if( typeof(m) === 'function' ) {
+      methods[k] = util.bind(m, context);
+    }
+  });
+  return methods;
+};
+
+util.printf = function() {
+  var localArgs = util.toArray(arguments);
+  var template = localArgs.shift();
+  var matches = template.match(/(%s|%d|%j)/g);
+  if( matches && localArgs.length ) {
+    util.find(matches, function (m) {
+      template = template.replace(m, format(localArgs.shift(), m));
+      return localArgs.length === 0;
+    });
+  }
+  return template;
+};
+
+util.mergeToString = function(list) {
+  if( list.length === 0 ) { return null; }
+  else if( list.length === 1 ) { return list[0]; }
+  else {
+    return '[' + list.join('][') + ']';
+  }
+};
+
+// credits: http://stackoverflow.com/questions/1606797/use-of-apply-with-new-operator-is-this-possible
+util.construct = function(constructor, args) {
+  function F() {
+    return constructor.apply(this, args);
+  }
+  F.prototype = constructor.prototype;
+  return new F();
+};
+
+util.noop = function() {};
+
+var wrappingClasses = [];
+util.isFirebaseRef = function(x) {
+  // ES5 throws TypeError if getPrototypeOf() called on a non-object
+  if( !util.isObject(x) ) {
+    return false;
+  }
+
+  // necessary because instanceof won't work on Firebase Query objects
+  // so we can't simply do instanceof here
+  var proto = Object.getPrototypeOf(x);
+  if( proto && proto.constructor === util.Firebase.prototype.constructor ) {
+    return true;
+  }
+
+  //todo-hack: SDK 2.2.x no longer works with the above. This is a hack to make that work until fixed
+  if( typeof(x.ref) === 'function' && typeof(x.ref().transaction) === 'function' ) {
+    return true;
+  }
+
+  return util.isFirebaseRefWrapper(x);
+};
+
+util.isFirebaseRefWrapper = function(x) {
+  return util.contains(wrappingClasses, function(C) {
+    return x instanceof C;
+  });
+};
+
+util.isQueryRef = function(x) {
+  return util.isFirebaseRef(x) && typeof x.transaction !== 'function';
+};
+
+// Add a Class as a valid substitute for a Firebase reference, so that it will
+// pass util.isFirebaseRef(). This means that it must provide all the Firebase
+// API methods and behave exactly like a Firebase instance in all cases.
+util.registerFirebaseWrapper = function(WrappingClass) {
+  wrappingClasses.push(WrappingClass);
+};
+
+// for test units
+util._mockFirebaseRef = function(mock) {
+  util.Firebase = mock;
+};
+
+util.escapeEmail = function(email) {
+  return (email||'').replace('.', ',');
+};
+
+
+util.assertValidEvent = function(event) {
+  if( !util.contains(READ_EVENTS, event) ) {
+    throw new Error('Event must be one of ' + READ_EVENTS + ', but received ' + event);
+  }
+};
+
+/**
+ * Inherit prototype of another JS class. Adds an _super() method for the constructor to call.
+ * It takes any number of arguments (whatever the inherited classes constructor methods are),
+ *
+ * Limitations:
+ *    1. Inherited constructor must be callable with no arguments (to make instanceof work), but can be called
+ *       properly during instantiation with arguments by using _super(this, args...)
+ *    2. Can only inherit one super class, no exceptions
+ *    3. Cannot call prototype = {} after using this method
+ *
+ * @param {Function} Child
+ * @param {Function} Parent a class which can be constructed without passing any arguments
+ * @returns {Function}
+ */
+util.inherits = function(Child, Parent) {
+  var methodSets = [Child.prototype].concat(util.toArray(arguments).slice(2));
+  Child.prototype = new Parent();
+  Child.prototype.constructor = Parent;
+  util.each(methodSets, function(fnSet) {
+    util.each(fnSet, function(fn, key) {
+      Child.prototype[key] = fn;
+    });
+  });
+  Child.prototype._super = function() {
+    Parent.apply(this, arguments);
+  };
+  return Child;
+};
+
+util.deepCopy = function(data) {
+  if( !util.isObject(data) ) { return data; }
+  var out = util.isArrayLike(data)? [] : {};
+  util.each(data, function(v,k) {
+    out[k] = util.deepCopy(v);
+  });
+  return out;
+};
+
+util.pick = function(obj, keys) {
+  if( !util.isObject(obj) ) { return {}; }
+  var out = util.isArrayLike(obj)? [] : {};
+  util.each(keys, function(k) {
+    out[k] = obj[k];
+  });
+  return out;
+};
+
+util.eachByPath = function(map, data, callback, context) {
+  var dataByPath = {};
+  util.each(data, function(v,k) {
+    var p = map.pathFor(k);
+    var f = map.getField(k);
+    var key = f? f.id : k;
+    if( !util.has(dataByPath, p.name()) ) {
+      dataByPath[p.name()] = { path: p, data: {} };
+    }
+    dataByPath[p.name()].data[key] = v;
+  });
+
+  util.each(dataByPath, function(collated) {
+    callback.call(context, collated.path, collated.data);
+  });
+};
+
+function format(v, type) {
+  switch(type) {
+    case '%d':
+      return parseInt(v, 10);
+    case '%j':
+      v =  util.isObject(v)? JSON.stringify(v) : v+'';
+      if(v.length > 500) {
+        v = v.substr(0, 500)+'.../*truncated*/...}';
+      }
+      return v;
+    case '%s':
+      return v + '';
+    default:
+      return v;
+  }
+}
+
+function isArguments(o) {
+  return util.isObject(o) && o+'' === '[object Arguments]';
+}
+
+/****************************************
+ * POLYFILLS
+ ****************************************/
+
+// a polyfill for Function.prototype.bind (invoke using call or apply!)
+// credits: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind
+function bind(oThis) {
+  /*jshint validthis:true */
+  if (typeof this !== 'function') {
+    // closest thing possible to the ECMAScript 5 internal IsCallable function
+    throw new TypeError('Function.prototype.bind - what is trying to be bound is not callable');
+  }
+
+  var aArgs = Array.prototype.slice.call(arguments, 1),
+    fToBind = this,
+    FNOP = function () {},
+    fBound = function () {
+      return fToBind.apply(
+          this instanceof FNOP && oThis? this : oThis,
+          aArgs.concat(Array.prototype.slice.call(arguments))
+      );
+    };
+
+  FNOP.prototype = this.prototype;
+  fBound.prototype = new FNOP();
+
+  return fBound;
+}
+
+// a polyfill for Array.prototype.forEach (invoke using call or apply!)
+// credits: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach
+function forEach(fn, scope) {
+  /*jshint validthis:true */
+  var i, len;
+  for (i = 0, len = this.length; i < len; ++i) {
+    if (i in this) {
+      fn.call(scope, this[i], i, this);
+    }
+  }
+}
+
+// a polyfill for Array.isArray
+// credits: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/isArray
+function isArray(vArg) {
+  return Object.prototype.toString.call(vArg) === '[object Array]';
+}
+
+// a polyfill for Array.indexOf
+// credits: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/indexOf
+function indexOf(searchElement, fromIndex) {
+  /*jshint validthis:true */
+  if (this === null) {
+    throw new TypeError();
+  }
+  var n, k, t = Object(this),
+    len = t.length >>> 0;
+
+  if (len === 0) {
+    return -1;
+  }
+  n = 0;
+  if (arguments.length > 1) {
+    n = Number(arguments[1]);
+    if (n !== n) { // shortcut for verifying if it's NaN
+      n = 0;
+    } else if (n !== 0 && n !== Infinity && n !== -Infinity) {
+      n = (n > 0 || -1) * Math.floor(Math.abs(n));
+    }
+  }
+  if (n >= len) {
+    return -1;
+  }
+  for (k = n >= 0 ? n : Math.max(len - Math.abs(n), 0); k < len; k++) {
+    if (k in t && t[k] === searchElement) {
+      return k;
+    }
+  }
+  return -1;
+}
+
+}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
+},{"firebase":"firebase"}],"firebase-util":[function(require,module,exports){
+/**
+ * This file establishes the Firebase.util namespace and
+ * defines the exports for all packages when using node.js
+ */
+'use strict';
+
+var util = require('./common/index.js');
+
+// put all our public methods into the exported scope
+util.extend(exports,
+  require('./common/exports.js'),
+  require('./NormalizedCollection/exports.js'),
+  require('./Paginate/exports.js')
+);
+
+/*global window */
+if( typeof window !== 'undefined' ) {
+  if( !window.hasOwnProperty('Firebase') ) {
+    console.warn('Firebase not found on the global window instance. Cannot add Firebase.util namespace.');
+  }
+  else {
+    window.Firebase.util = util;
+  }
+}
+},{"./NormalizedCollection/exports.js":2,"./Paginate/exports.js":18,"./common/exports.js":24,"./common/index.js":25}]},{},[1]);
diff --git a/dist/firebase-util.min.js b/dist/firebase-util.min.js
new file mode 100644
index 0000000..80f7db6
--- /dev/null
+++ b/dist/firebase-util.min.js
@@ -0,0 +1,11 @@
+/*!
+ * Firebase-util:  A set of experimental power tools for Firebase.
+ *
+ * Version: 0.2.6
+ * URL: https://github.com/firebase/firebase-util
+ * Date: 2016-11-21T15:08:35.102Z
+ * License: MIT http://firebase.mit-license.org/
+ */
+require=function t(e,i,r){function n(o,a){if(!i[o]){if(!e[o]){var h="function"==typeof require&&require;if(!a&&h)return h(o,!0);if(s)return s(o,!0);var u=new Error("Cannot find module '"+o+"'");throw u.code="MODULE_NOT_FOUND",u}var c=i[o]={exports:{}};e[o][0].call(c.exports,function(t){var i=e[o][1][t];return n(i?i:t)},c,c.exports,t,e,i,r)}return i[o].exports}for(var s="function"==typeof require&&require,o=0;o<r.length;o++)n(r[o]);return n}({1:[function(t,e,i){(function(e){e.Firebase&&(e.Firebase.util=t("firebase-util"))}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{"firebase-util":void 0}],2:[function(t,e,i){i.NormalizedCollection=t("./libs/NormalizedCollection.js")},{"./libs/NormalizedCollection.js":6}],3:[function(t,e,i){"use strict";function r(t,e,i){var r=this;r._ref=null,r._map=t,r._name=e,r._url=i,r.lastMergedValue=s.undef,r._obs=new s.Observable(["child_added","child_removed","child_changed","child_moved","value"],{onAdd:function(t){var e=r._obs.getObservers(t).length;1===e&&r._start(t,r._obs.getObservers().length)},onRemove:function(t){var e=r._obs.getObservers(t).length;0===e&&r._stop(t,r._obs.getObservers().length)}})}function n(t){return function(){throw new Error("Classes implementing AbstractRecord must declare "+t)}}var s=t("../../common/");r.prototype={_start:n("_start"),_stop:n("_stop"),hasChild:n("hasChild"),forEachKey:n("forEach"),getChildSnaps:n("getChildSnaps"),mergeData:n("mergeData"),getClass:n("getClass"),saveData:n("saveData"),getPriority:n("getPriority"),makeChild:n("makeChild"),watch:function(t,e,i,r){this._obs.observe(t,e,i,r)},unwatch:function(t,e,i){this._obs.stopObserving(t,e,i)},getFieldMap:function(){return this._map},getPathManager:function(){return this._map.getPathManager()},setRef:function(t){this._ref=t},getRef:function(){return this._ref},child:function(t){return this.getRef().ref().child(t).$getRecord()},getName:function(){return this._name},getUrl:function(){return this._url},trigger:function(t){s.log.debug("AbstractRecord._trigger: %s",t.toString()),this._obs.triggerEvent(t.event,t.create(this.getRef()))},_cancel:function(t){s.error(t),this._obs.abortObservers(t)}},e.exports=r},{"../../common/":25}],4:[function(t,e,i){"use strict";function r(t){this.fields={},this.length=0,this.pathMgr=t}function n(t,e){return u.find(t,function(t){return t.pathName===e.path&&t.id===e.field})||null}function s(t){this.path=t.path,this.id=t.id,this.key=t.key,this.alias=t.alias,this.url=t.url,this.pathName=t.pathName,this.isNested=t.alias.indexOf(".")>=0}function o(t,e){if(t instanceof s)return u.pick(t,["path","id","key","alias","pathName","url"]);"string"==typeof t&&(t={key:t});var i=t.key.split("."),r=e.getPath(i[0]);return{pathName:i[0],id:i[1],key:t.key,alias:t.alias||i[1],path:r,url:r?r.url()+"/"+i[1]:null}}function a(t,e,i){if(null!==i){if(e.indexOf(".")>0){for(var r,n=e.split(".").reverse();n.length>1&&(r=n.pop());)t=t[r]=u.has(t,r)?t[r]:{};e=n.pop()}t[e]=i}}function h(t,e){var i=e;if(!u.isObject(t))return u.undef;var r=t[e];if(e.indexOf(".")>0){var n=e.split(".").reverse();for(r=t;n.length;)i=n.pop(),r=u.isObject(r)&&r.hasOwnProperty(i)?r[i]:u.undef}return r}var u=t("../../common"),c=t("./PathManager");r.prototype={add:function(t){var e=new s(o(t,this.pathMgr));if(this.fields.hasOwnProperty(e.alias))throw new Error("Duplicate field alias "+e.alias+"("+e.key+")");if(null===e.path)throw new Error("Invalid path specified for field "+e.key+"; it was not in the paths provided, which are : "+this.pathMgr.getPathNames().join(","));var i=e.path.getDependency();if(null!==i&&null===n(this.fields,i))throw new Error("Dynamic paths must reference a field declared in the map. Please add "+r.key(i.path,i.field)+" to the select() criteria before using it in a dynamic field");this.fields[e.alias]=e,this.length++},forEach:function(t,e){return u.find(this.fields,t,e)!==u.undef},getField:function(t){return this.fields[t]||null},getPath:function(t){return this.getPathManager().getPath(t)},getPathManager:function(){return this.pathMgr},pathFor:function(t){var e=this.getField(t);return e?e.path:this.pathMgr.first()},fieldsFor:function(t){return u.filter(u.toArray(this.fields),function(e){return e.pathName===t})},aliasFor:function(t){var e=u.find(this.fields,function(e){return e.url===t},this);return e?e.alias:null},extractData:function(t,e){var i={},r=this.pathMgr.getPathName(t.ref().toString());if(null===r&&null!==t.ref().parent()){var n=this.pathMgr.getPathFor(t.ref().parent().toString());n&&n.hasDependency()&&(r=n.name())}var s=e?"exportVal":"val";return u.each(this.fieldsFor(r),function(e){switch(e.id){case"$key":a(i,e.alias,t.key());break;case"$value":a(i,e.alias,t[s]());break;default:t.hasChild(e.id)&&a(i,e.alias,t.child(e.id)[s]())}}),i},snapFor:function(t,e){var i,r=this.pathFor(e);if(!r)return null;var s=r.getDependency();if(null!==s){var o=n(this.fields,s),a=this.snapFor(t,o.alias);a&&(i="$key"===s.field?r.child(a.key()).url():"$value"===s.field?r.child(a.val()).url():r.child(a.child(s.field).val()).url())}else i=r.url();return i?u.find(t,function(t){return t.ref().toString()===i})||null:null},denest:function(t){var e={};return u.each(this.getPathManager().getPaths(),function(t){e[t.name()]={path:t,data:{}}}),this.forEach(function(i){var r=h(t,i.alias);if(r!==u.undef)switch(i.id){case"$value":e[i.pathName].data=r;break;case"$key":break;default:e[i.pathName].data[i.id]=r}}),e},idFor:function(t){var e=this.getField(t);return e?e.id:t}},r.key=function(t,e){return"string"!=typeof t&&(t=t.name()),t+"."+e},r.fieldMap=function(t,e){var i,n=t.getField(e);n?(i=n.path,"$value"!==n.id&&(i=i.child(n.id))):i=t.pathFor(e).child(e);var s=new c([i]),o=new r(s);return o.add({key:r.key(i,"$value"),alias:e}),o},r.recordMap=function(t,e){var i=t.getPathManager(),n=u.map(i.getPaths(),function(t){return t.normChild(e)}),s=new r(new c(n));return t.forEach(function(t){s.add({key:t.key,alias:t.alias})}),s},e.exports=r},{"../../common":25,"./PathManager":10}],5:[function(t,e,i){"use strict";function r(){this.criteria=[],s.each(arguments,this.add,this)}function n(t){this.match=t}var s=t("../../common");r.prototype={add:function(t){this.criteria.push(new n(t))},test:function(t,e,i){return s.contains(this.criteria,function(r){return!r.test(t,e,i)})===!1}},n.prototype.test=function(t,e,i){return this.match(t,e,i)===!0},e.exports=r},{"../../common":25}],6:[function(t,e,i){"use strict";function r(t){n(arguments),this.pathMgr=new u(h.toArray(arguments)),this.map=new l(this.pathMgr),this.filters=new c,this.finalized=!1}function n(t){function e(t){return h.isArray(t)&&(t=t[0]),!h.isFirebaseRef(t)}if(t.length<1)throw new Error("Must provide at least one path definition");if(h.contains(t,e))throw new Error("Each argument to the NormalizedCollection constructor must be a valid Firebase reference or an Array containing a Firebase ref as the first argument")}function s(t,e){if(t.finalized)throw new Error("Cannot call "+e+"() after ref() has been invoked")}function o(t){var e=[],i=[],r="";return h.each(t.pathMgr.getPaths(),function(t){var i=t.getDependency();e.push(h.printf('\t"%s%s"%s',t.url(),t.id()===t.name()?"":" as "+t.name(),i?"-> "+i.path+"."+i.field:""))}),t.map.forEach(function(t){i.push(h.printf('"%s%s"',t.key,t.alias===t.id?"":" as "+t.alias)),i.length%5===0&&i.push("\n")}),t.filters.criteria.length>0&&(r=h.printf("<%s filters applied>",t.filters.criteria.length)),h.printf("NormalizedCollection(\n%s\n).select(%s)%s.ref()",e.join("\n"),i.join(", "),r)}function a(t){var e;if(e="string"==typeof t?t:h.has(t,"key")?t.key:h.undef,"string"!=typeof e||e.indexOf(".")<=0)throw new Error('Each field passed to NormalizedCollection.select() must either be a string in the format "pathAlias.fieldId", or an object in the format {key: "pathAlias.fieldId", alias: "any_name_for_field"}, but I received '+JSON.stringify(t))}var h=t("../../common"),u=t("./PathManager"),c=t("./Filter"),l=t("./FieldMap"),f=t("./NormalizedRef"),d=t("./RecordSet");r.prototype={select:function(t){s(this,"select");var e=h.args("NormalizedCollection.select",arguments,1);return h.each(e.restAsList(0,["string","object"]),function(t){a(t),this.map.add(t)},this),this},filter:function(t){s(this,"filter");var e=h.args("NormalizedCollection.filter",arguments,1,1);return this.filters.add(e.nextReq("function")),this},ref:function(){if(!this.map.length)throw new Error("Must call select() with at least one field before creating a ref");this.finalized=!0,h.log.isInfoEnabled()&&h.log.info("NormalizedRef created using %s",o(this));var t=new d(this.map,this.filters);return new f(t)}},e.exports=r},{"../../common":25,"./FieldMap":4,"./Filter":5,"./NormalizedRef":7,"./PathManager":10,"./RecordSet":14}],7:[function(t,e,i){"use strict";function r(t,e){this._super(this,t),this._parent=e||null,this._key=t.getName(),this._toString=t.getUrl()}function n(t){return function(){var e=a.toArray(arguments);a.each(this.$getPaths(),function(i){var r=i.ref();r[t].apply(r,e)})}}function s(t){return function(){var e=a.toArray(arguments),i=this.$getMaster();return i[t].apply(i,e)}}function o(t){return function(){throw new Error(t+" is not supported for NormalizedCollection references. Try calling it on the original reference used to create the NormalizedCollection instead.")}}var a=t("../../common"),h=t("./Query");a.inherits(r,h,{child:function(t){for(var e=t.split("/").reverse(),i=this,n=this;e.length;){var s=e.pop();n=new r(n.$getRecord().makeChild(s),i),i=n}return n},parent:function(){return this._parent},root:function(){for(var t=this;null!==t.parent();)t=t.parent();return t},name:function(){return console.warn("The name() function has been deprecated. Use key() instead."),this.key()},key:function(){return this._key},toString:function(){return this._toString},set:function(t,e,i){this.$getRecord().saveData(t,{callback:e,context:i,isUpdate:!1})},update:function(t,e,i){this.$getRecord().saveData(t,{callback:e,context:i,isUpdate:!0})},remove:function(t,e){this.$getRecord().saveData(null,{callback:t,context:e,isUpdate:!1})},push:function(t,e,i){var r=this.$getMaster().push().key(),n=this.child(r);return arguments.length&&n.set.apply(n,arguments),n},setWithPriority:function(t,e,i,r){this.$getRecord().saveData(t,{callback:i,context:r,isUpdate:!1,priority:e})},setPriority:function(t,e,i){this.$getMaster().setPriority(t,e,i)},auth:s("auth"),unauth:s("unauth"),authWithCustomToken:s("authWithCustomToken"),authAnonymously:s("authAnonymously"),authWithPassword:s("authWithPassword"),authWithOAuthPopup:s("authWithOAuthPopup"),authWithOAuthRedirect:s("authWithOAuthRedirect"),authWithOAuthToken:s("authWithOAuthToken"),getAuth:s("getAuth"),onAuth:s("onAuth"),offAuth:s("offAuth"),createUser:s("createUser"),changePassword:s("changePassword"),removeUser:s("removeUser"),resetPassword:s("resetPassword"),changeEmail:s("changeEmail"),goOffline:n("goOffline"),goOnline:n("goOnline"),transaction:o("transaction"),onDisconnect:o("onDisconnect")}),e.exports=r},{"../../common":25,"./Query":11}],8:[function(t,e,i){"use strict";function r(t,e){if(this._ref=t,this._rec=t.$getRecord(),!n.isArray(e))throw new Error("Must provide an array of snapshots to merge");this._pri=this._rec.getPriority(e),this._snaps=e}var n=t("../../common");r.prototype={val:function(){return this._snaps.length?this._rec.mergeData(this._snaps,!1):null},child:function(t){var e,i=t.split("/").reverse(),n=i.pop();for(e=new r(this._ref.child(n),this._rec.getChildSnaps(this._snaps,n));i.length;)e=e.child(i.pop());return e},forEach:function(t,e){return this._rec.forEachKey(this._snaps,function(i,r){return"$value"!==i&&"$key"!==i&&t.call(e,this.child(r))},this)},hasChild:function(t){for(var e=t.split("/").reverse(),i=e.length>0,r=this._ref,n=this;i&&e.length;){var s=e.pop();i=r.$getRecord().hasChild(n._snaps,s),i&&e.length&&(r=r.child(s),n=n.child(s))}return i},hasChildren:function(){return this._rec.forEachKey(this._snaps,function(t){return"$key"!==t&&"$value"!==t})},name:function(){return console.warn("name() has been deprecated. Use key() instead."),this.key()},key:function(){return this._rec.getName()},numChildren:function(){var t=0;return this._rec.forEachKey(this._snaps,function(e){"$key"!==e&&"$value"!==e&&t++}),t},ref:function(){return this._ref.ref()},getPriority:function(){return this._pri},exportVal:function(){return this._rec.mergeData(this._snaps,!0)},exists:function(){return null!==this.val()}},e.exports=r},{"../../common":25}],9:[function(t,e,i){"use strict";function r(t,e){var i=n(t);this._ref=i.ref,this._alias=i.alias,this._dep=i.dep,this._parent=e||null}function n(t){var e,i,r=null;return o.isArray(t)?(e=t[0],i=t[1],r=t[2]):e=o.isFunction(t.ref)?t.ref():t,{ref:e,alias:i||e.key(),dep:s(r)}}function s(t){if(o.isObject(t))return t;if(t){var e=t.split(".");return{path:e[0],field:e[1]}}return null}var o=t("../../common");r.prototype={ref:function(){return this._ref},reff:function(){return this.ref().ref()},child:function(t){return new r(this.reff().child(t),this)},normChild:function(t){var e=this.getDependency();return null!==e?new r([this.reff(),this.name(),e.path+"."+e.field],this):new r([this.reff().child(t),this.name()],this)},hasDependency:function(){return null!==this._dep},getDependency:function(){return this._dep},url:function(){return this.reff().toString()},name:function(){return this._alias},id:function(){return this.reff().key()},parent:function(){return this._parent},clone:function(){return new r([this._ref,this._alias,this._dep],this._parent)}},e.exports=r},{"../../common":25}],10:[function(t,e,i){"use strict";function r(t){this.paths=[],this.pathsByUrl={},this.deps={},this.pathNames=[],o.each(t,this.add,this)}function n(t,e){return o.map(t,function(t){return e[t].path+"."+e[t].field}).join(" >> ")}var s=t("./Path"),o=t("../../common");r.prototype={add:function(t){var e=t instanceof s?t.clone():new s(t);if(!this.paths.length&&e.hasDependency())throw new Error("The master path (i.e. the first) may not declare a dependency. Perhaps you have put the wrong path first in the list?");if(o.has(this.pathsByUrl,e.url()))throw new Error("Duplicate path: "+e.url());if(o.contains(this.pathNames,e.name()))throw new Error("Duplicate path name. The .key() value for each path must be unique, or you can give each a path an alias by using [firebaseRef, alias] in the constructor. The aliases must also be unique.");this._map(e),this.paths.push(e),this.pathsByUrl[e.url()]=e.name(),this.pathNames.push(e.name())},count:function(){return this.paths.length},first:function(){return this.paths[0]},getPath:function(t){return o.find(this.paths,function(e){return e.name()===t})||null},getPathFor:function(t){var e=this.getPathName(t);return e?this.getPath(e):null},getPaths:function(){return this.paths.slice()},getPathName:function(t){return this.pathsByUrl[t]||null},getPathNames:function(){return this.pathNames.slice()},getUrls:function(){return o.keys(this.pathsByUrl)},getDependencyGraph:function(){return o.extend(!0,this.deps)},_map:function(t){var e=this.first(),i=t.getDependency();!i&&e&&(i={path:e.name(),field:"$key"}),i&&(this.deps[t.name()]=i,this._assertNotCircularDep(t.name()))},_assertNotCircularDep:function(t){for(var e=[t],i=this.deps[t];o.isDefined(i);){var r=i.path;if(o.contains(e,r))throw e.push(r),new Error("Circular dependencies in paths: "+n(e,this.deps));e.push(r),i=o.val(this.deps,r)}}},e.exports=r},{"../../common":25,"./Path":9}],11:[function(t,e,i){"use strict";function r(t,e){var i=this;i._ref=t,i._rec=e,e&&e.setRef(i)}var n=t("../../common"),s=t("./Transmogrifier");r.prototype={on:function(t,e,i,r){function s(t){"function"==typeof i&&null!==t&&i.call(r,t)}return 3===arguments.length&&n.isObject(i)&&(r=i,i=n.undef),this.$getRecord().watch(t,e,s,r),e},once:function(t,e,i,r){function s(i){a.off(t,s),e.call(r,i)}function o(t){"function"==typeof i&&null!==t&&i.call(r,t)}var a=this;return 3===arguments.length&&n.isObject(i)&&(r=i,i=n.undef),this.on(t,s,o)},off:function(t,e,i){this.$getRecord().unwatch(t,e,i)},orderByChild:function(){return this.$replicate("orderByChild",n.toArray(arguments))},orderByKey:function(){return this.$replicate("orderByKey",n.toArray(arguments))},orderByValue:function(){return this.$replicate("orderByValue",n.toArray(arguments))},orderByPriority:function(){return this.$replicate("orderByPriority",n.toArray(arguments))},limitToFirst:function(){return this.$replicate("limitToFirst",n.toArray(arguments))},limitToLast:function(){return this.$replicate("limitToLast",n.toArray(arguments))},limit:function(){return this.$replicate("limit",n.toArray(arguments))},startAt:function(){return this.$replicate("startAt",n.toArray(arguments))},endAt:function(){return this.$replicate("endAt",n.toArray(arguments))},equalTo:function(){return this.$replicate("equalTo",n.toArray(arguments))},ref:function(){return this._ref},$getRecord:function(){return this._rec},$getMaster:function(){return this._rec.getPathManager().first().ref()},$getPaths:function(){return this._rec.getPathManager().getPaths()},$replicate:function(t,e){var i=this.$getRecord(),n=this.$getMaster();return n=n[t].apply(n,e),new r(this._ref,s.replicate(i,n))}},n.registerFirebaseWrapper(r),e.exports=r},{"../../common":25,"./Transmogrifier":17}],12:[function(t,e,i){"use strict";function r(t){var e=t.getPathManager().first().id(),i=f.mergeToString(t.getPathManager().getUrls());this._super(t,e,i),this._eventManagers={},f.log.debug("Record created",this.getName(),this.getUrl())}function n(t){this.rec=t,this.pm=t.getPathManager(),this.running=!1,this._init()}function s(t,e){this.event=t,this.rec=e,this.map=e.getFieldMap(),this.pm=e.getPathManager(),this.subs=[],this.dyno=null}function o(t,e,i,r){var n=t.getDependency(),s=e.getPath(n.path),o=s.ref();if("$key"===n.field)throw new Error("Dynamic paths do not support $key (you should probably just join on this path)");"$value"!==n.field&&(o=o.child(n.field));var a,h=o.on("value",function(e){a&&a.key()!==e.val()&&(f.log.debug("Record.Dyno: stopped monitoring %s",a.toString()),a.off(i,r),r(null)),null!==e.val()&&(a=t.ref().child(e.val()),a.on(i,r),f.log("Record.Dyno: monitoring %s",a.toString()))});this.dispose=function(){o.off("value",h),a&&a.off(i,r)}}function a(t,e,i){f.each(t.fieldsFor(e.name()),function(t){switch(t.id){case"$key":break;case"$value":f.has(i,".value")||(i[".value"]=null);break;default:f.has(i,t.id)||(i[t.id]=null)}})}var h=t("./FieldMap"),u=t("./RecordField"),c=t("./AbstractRecord"),l=t("./SnapshotFactory"),f=t("../../common");f.inherits(r,c,{makeChild:function(t){var e=h.fieldMap(this.getFieldMap(),t);return new u(e)},hasChild:function(t,e){var i=this.getFieldMap().getField(e);if(!i)return!1;var r=this.getFieldMap().snapFor(t,e);return null!==r&&r.hasChild(e)},getChildSnaps:function(t,e){var i,r=this.getFieldMap().snapFor(t,e),n=this.getFieldMap().getField(e);if(n)switch(n.id){case"$key":throw new Error("Cannot get child snapshot from key (not a real child element)");case"$value":i=r;break;default:i=r.child(n.id)}else i=r.child(e);return[i]},forEachKey:function(t,e,i){function r(t,e){switch(e){case"$key":return!0;case"$value":return t&&null!==t.val();default:return t&&t.hasChild(e)}}var n=this.getFieldMap();return n.forEach(function(s){var o=n.snapFor(t,s.alias);return!!r(o,s.id)&&e.call(i,s.id,s.alias)===!0})},mergeData:function(t,e){var i=null,r=this.getFieldMap();return t.length>0&&null!==t[0].val()&&(i=f.extend.apply(null,f.map(t,function(t){return r.extractData(t,e)})),e&&null!==i&&null!==t[0].getPriority()&&(f.isObject(i)||(i={".value":i}),i[".priority"]=t[0].getPriority())),i},getPriority:function(t){return t[0].getPriority()},getClass:function(){return r},saveData:function(t,e){var i=f.queue(),r=this.getFieldMap(),n=this.getPathManager().getPaths();if(e.isUpdate&&!f.isObject(t))throw new Error("First argument to update() command must be an object");if(null===t)f.each(n,function(t){t.hasDependency()||t.reff().remove(i.getHandler())});else if(f.isObject(t)){var s=r.denest(t);f.each(s,function(t){var o=t.path,h=t.data,u=this._writeRef(s,o);null!==u?f.isEmpty(h)&&e.isUpdate||(f.isObject(h)||(h={".value":h}),e.isUpdate||a(r,o,h),f.isDefined(e.priority)&&(h[".priority"]=e.priority),f.has(h,".value")?u.set(h,i.getHandler()):u.update(h,i.getHandler())):f.log.info("No dynamic key found for master",n[0].ref().toString(),"with dynamic path",o.ref().toString())},this)}else{if(1!==n.length)throw new Error("Cannot set multiple paths to a non-object value. Since this is a NormalizedCollection, the data will be split between the paths. But I can't split a primitive value");f.isDefined(e.priority)?n[0].ref().setWithPriority(t,e.priority,i.getHandler()):n[0].ref().set(t,i.getHandler())}i.handler(e.callback||f.noop,e.context)},getName:function(){return this._name},getUrl:function(){return this._url},_start:function(t){f.has(this._eventManagers,t)||(f.log.debug("Record._start: event=%s, url=%s",t,this.getUrl()),this._eventManagers[t]="value"===t?new n(this):new s(t,this)),this._eventManagers[t].start()},_stop:function(t){f.has(this._eventManagers,t)&&(f.log.debug("Record._stop: event=%s, url=%s",t,this.getUrl()),this._eventManagers[t].stop())},_writeRef:function(t,e){var i=e.reff(),r=e.getDependency();if(null!==r){var n=this.getPathManager().getPath(r.path),s=this._depKey(t,n,r.field);i=null===s?null:i.child(s)}return i},_depKey:function(t,e,i){var r,n=t[e.name()].data;switch(i){case"$key":r=e.id();break;case"$value":r=f.has(n,".value")?n[".value"]:f.isEmpty(n)?null:n;break;default:r=f.has(n,i)?n[i]:null}var s=typeof r;if(null!==r&&"string"!==s)throw new Error("Dynamic key values must be a string. Type was "+s+" for "+e.ref().toString()+"->"+i);return r}}),n.prototype={start:function(){this.running||(this.running=!0,f.each(this.pm.getPathNames(),this._startPath,this))},stop:function(){this.running&&(this.running=!1,f.each(this.subs,function(t){t()}),this._init())},update:function(t,e){this.snaps[t]=e,this._checkLoadState(),f.log("Record.ValueEventManager.update: url=%s, loadCompleted=%s",e.ref().toString(),this.loadCompleted),this.loadCompleted&&this.rec.trigger(new l("value",this.rec.getName(),f.toArray(this.snaps)))},_startPath:function(t){var e=this,i=e.pm.getPath(t),r=f.bind(e.update,e,t);if(i.hasDependency()){var n=new o(i,this.rec.getFieldMap(),"value",r);this.subs.push(n.dispose)}else i.ref().on("value",r),e.subs.push(function(){i.ref().off("value",r)})},_checkLoadState:function(){if(!this.loadCompleted){var t=this.snaps,e=this.pm.getPathNames();this.loadCompleted=!f.contains(e,function(e){return!t.hasOwnProperty(e)})}},_init:function(){this.loadCompleted=!1,this.snaps={},this.subs=[]}},s.prototype={start:function(){f.each(this.pm.getPathNames(),function(t){var e=this.event,i=this.pm.getPath(t),r=f.bind(this.update,this);i.hasDependency()?(this.dyno=new o(i,this.map,e,r),this.subs.push(this.dyno.dispose)):(i.ref().on(e,r),this.subs.push(function(){i.ref().off(e,r)}))},this)},stop:function(){f.each(this.subs,function(t){t()}),this.subs=[]},update:function(t,e){null!==t&&null!==this.map.aliasFor(t.ref().toString())&&(f.log("Record.ChildEventManager.update: event=%s, key=%s/%s",this.event,t.ref().parent().key(),t.key()),this.rec.trigger(new l(this.event,t.key(),t,e)))}},e.exports=r},{"../../common":25,"./AbstractRecord":3,"./FieldMap":4,"./RecordField":13,"./SnapshotFactory":16}],13:[function(t,e,i){"use strict";function r(t){if(this.handlers={},this.path=t.getPathManager().first(),this._super(t,this.path.name(),this.path.url()),1!==t.getPathManager().count())throw new Error("RecordField must have exactly one path, but we got "+t.getPathManager().count());if(1!==t.length)throw new Error("RecordField must have exactly one field, but we found "+t.length);u.log.debug("RecordField created",this.getName(),this.getUrl())}function n(t){return t.callback?function(){t.callback.apply(t.context,arguments)}:u.noop}var s=t("./PathManager"),o=t("./FieldMap"),a=t("./AbstractRecord"),h=t("./SnapshotFactory"),u=t("../../common");u.inherits(r,a,{makeChild:function(t){var e=new s([this.path.child(t)]),i=new o(e);return i.add({key:o.key(e.first(),"$value"),alias:t}),new r(i)},hasChild:function(t,e){return t[0].hasChild(e)},getChildSnaps:function(t,e){return[t[0].child(e)]},mergeData:function(t,e){return e?t[0].exportVal():t[0].val()},getPriority:function(t){return t[0].getPriority()},forEachKey:function(t,e,i){var r=t[0];return r.forEach(function(t){e.call(i,t.key(),t.key())})},saveData:function(t,e){var i=this.path.ref();if(e.isUpdate){if(!u.isObject(t))throw new Error("When using update(), the data must be an object.");u.has(e,"priority")&&(t[".priority"]=e.priority),i.update(t,n(e))}else u.has(e,"priority")?i.setWithPriority(t,e.priority,n(e)):i.set(t,n(e))},getClass:function(){return r},_start:function(t){var e=this;this.handlers[t]=function(i,r){e.trigger(new h(t,i.key(),i,r))},this.path.ref().on(t,this.handlers[t],this._cancel,this)},_stop:function(t){this.handlers.hasOwnProperty(t)&&this.path.ref().off(t,this.handlers[t],this)}}),e.exports=r},{"../../common":25,"./AbstractRecord":3,"./FieldMap":4,"./PathManager":10,"./SnapshotFactory":16}],14:[function(t,e,i){"use strict";function r(t,e){var i=o.mergeToString(t.getPathManager().getPathNames()),r=o.mergeToString(t.getPathManager().getUrls());this._super(t,i,r),this.filters=e,this.monitor=new h(this)}var n=t("./Record"),s=t("./AbstractRecord"),o=t("../../common"),a=t("./FieldMap"),h=t("./RecordSetEventManager");o.inherits(r,s,{makeChild:function(t){var e=a.recordMap(this.getFieldMap(),t);return new n(e)},hasChild:function(t,e){return o.contains(t,function(t){return t.key()===e})},getChildSnaps:function(t,e){return o.filter(t,function(t){return t.key()===e})},mergeData:function(t,e){var i=this,r=null;return t.length&&null!==t[0].val()&&(r={},o.each(t,function(t){null!==t.val()&&i.filters.test(t.val(),t.key(),t.getPriority())&&(r[t.key()]=e?t.exportVal():t.val())})),r},getPriority:function(){return null},forEachKey:function(t,e,i){t.forEach(function(t){return e.call(i,t.key(),t.key())})},getClass:function(){return r},saveData:function(t,e){var i=o.queue();if(null===t)o.each(this.getPathManager().getPaths(),function(t){t.ref().remove(i.getHandler())});else{if(!o.isObject(t))throw new Error("Calls to set() or update() on a NormalizedCollection must pass either null or an object value. There is no way to split a primitive value between the paths");o.each(t,function(t,r){if(".value"===r||".priority"===r)throw new Error("Cannot use .priority or .value on the root path of a NormalizedCollection. You probably meant to sort the records anyway (i.e. one level lower).");this.child(r).saveData(t,{isUpdate:e.isUpdate,callback:i.getHandler()})},this),e.priority&&this.getPathManager().first().ref().setPriority(e.priority,i.getHandler())}i.handler(e.callback||o.noop,e.context)},_getChildKey:function(t,e,i){var r=i,n=this.getPathManager().getPathFor(t.ref().toString());if(n.hasDependency()){var s=n.getDependency(),a=this.getFieldMap().getPath(s.path);if(!a)throw new Error("Invalid dependency path. "+t.ref.toString()+" depends on "+s.path+", but that alias does not exist in the paths provided.");var h=o.find(e,function(t){return t.ref().toString()===a.url()});h?(h=h.child(i),"$value"!==s.field&&(h=h.child(s.field)),r=h.val()):r=null}return r},_start:function(){this.monitor.start()},_stop:function(t,e){0===e&&this.monitor.stop()}}),e.exports=r},{"../../common":25,"./AbstractRecord":3,"./FieldMap":4,"./Record":12,"./RecordSetEventManager":15}],15:[function(t,e,i){"use strict";function r(t){var e=t.getPathManager();this.masterRef=e.first().ref(),this.url=this.masterRef.toString(),this.recList=new n(t,this.url),this.running=!1}function n(t,e){this.obs=t,this.url=e,this._reset()}var s=t("./SnapshotFactory"),o=t("../../common");r.prototype={start:function(){return this.running||(o.log("RecordSetEventManager: Loading normalized records from master list %s",this.url),this.running=!0,this.masterRef.on("child_added",this._add,this),this.masterRef.on("child_removed",this._remove,this),this.masterRef.on("child_moved",this._move,this),this.masterRef.once("value",this.recList.masterPathLoaded,this.recList)),this},stop:function(){return this.running&&(o.log("RecordSetEventManager: Stopped monitoring master list %s",this.url),this.running=!1,this.masterRef.off("child_added",this._add,this),this.masterRef.off("child_removed",this._remove,this),this.masterRef.off("child_moved",this._move,this),this.recList.unloaded()),this},_add:function(t,e){this.recList.add(t.key(),e)},_remove:function(t){this.recList.remove(t.key())},_move:function(t,e){this.recList.move(t.key(),e)}},n.prototype={add:function(t,e){o.log.debug("RecordList.add: key=%s, prevChild=%s",t,e);var i=this.obs.child(t),r=o.bind(this._valueUpdated,this,t);this.loading[t]={rec:i,prev:e,fn:r,unwatch:function(){i.unwatch("value",r)}},this.loadComplete||this.initialKeysLeft.push(t),i.watch("value",r)},remove:function(t){o.log.debug("RecordList.remove: key=%s",t);var e=this._dropRecord(t);null!==e&&this._notify("child_removed",t,e)},move:function(t,e){if(o.has(this.recs,t)){var i=o.indexOf(this.recIds,t);this.recIds.splice(i,1),this._putAfter(t,e),this._notify("child_moved",t)}},masterPathLoaded:function(){o.log.debug("RecordList: Initial data has been loaded from master list at %s",this.url),this.masterLoaded=!0,this._checkLoadState()&&this._notifyValue()},unloaded:function(){this._reset()},findKey:function(t){return o.indexOf(this.recIds,t)},_reset:function(){o.each(this.recs,function(t,e){this.remove(e)},this),o.each(this.filtered,function(t,e){this._dropRecord(e)},this),o.each(this.loading,function(t,e){this._dropRecord(e)},this),this.recs={},this.recIds=[],this.snaps={},this.loading={},this.filtered={},this.loadComplete=!1,this.initialKeysLeft=[],this.masterLoaded=!1},_valueUpdated:function(t,e){var i;this.snaps[t]=e,o.has(this.loading,t)?(i=this.loading[t],delete this.loading[t],this._processAdd(e,i)):o.has(this.recs,t)?(i=this.recs[t],this._processChange(e,i)):o.has(this.filtered,t)?null!==e.val()&&this.obs.filters.test(e.val(),t,e.getPriority())&&(i=this.filtered[t],delete this.filtered[t],o.log("RecordList: Unfiltered key %s",t),this._processAdd(e,i)):o.log("RecordList: Orphan key %s ignored. Probably a concurrent edit.",t)},_processAdd:function(t,e){var i=t.key();this.obs.filters.test(t.val(),i,t.getPriority())?(this.recs[i]=e,this._putAfter(i,e.prev),this._notify("child_added",i)):(o.log("RecordList: Filtered key %s",i),this.filtered[i]=e),this._checkLoadState(i)&&this._notifyValue()},_processChange:function(t,e){if(null!==t.val()){var i=t.key();this.obs.filters.test(t.val(),i,t.getPriority())?this._notify("child_changed",i):(delete this.recs[i],this.filtered[i]=e,this._notify("child_removed",i,this.snaps[i]))}},_notify:function(t,e,i){var r;"child_added"!==t&&"child_moved"!==t||(r=this._getPrevChild(e)),o.log("RecordList._notify: event=%s, key=%s, prev=%s",t,e,r);var n=new s(t,e,i||this.snaps[e],r);this.obs.trigger(n),this._notifyValue()},_notifyValue:function(){if(this.loadComplete){o.log.debug("RecordList._notifyValue: snap_keys=%s",o.keys(this.snaps));var t=new s("value",null,o.toArray(this.snaps));this.obs.trigger(t)}},_getPrevChild:function(t){if(!this.recIds.length)return null;var e=this.findKey(t);return e===-1?this.recIds[this.recIds.length-1]:0===e?null:this.recIds[e-1]},_posFor:function(t){var e,i;return null===t?e=0:(i=this.findKey(t),e=i===-1?this.recIds.length:i+1),e},_putAfter:function(t,e){var i=this._posFor(e);this.recIds.splice(i,0,t)},_dropRecord:function(t){var e=null;return this.recs[t]&&(e=this.snaps[t],this.recs[t].unwatch()),this.loading[t]&&this.loading[t].unwatch(),o.has(this.filtered,t)&&this.filtered[t].unwatch(),delete this.loading[t],delete this.snaps[t],delete this.filtered[t],delete this.recs[t],o.remove(this.recIds,t),e},_checkLoadState:function(t){return!(this.loadComplete||(t&&o.remove(this.initialKeysLeft,t),this.initialKeysLeft.length||!this.masterLoaded))&&(this.loadComplete=!0,
+!0)}},e.exports=r},{"../../common":25,"./SnapshotFactory":16}],16:[function(t,e,i){"use strict";function r(t,e,i,r){this.event=t,this.key=e,this.snaps=s(i),this.prevChild=r,n(this)}function n(t){switch(t.event){case"value":break;case"child_added":case"child_moved":if("string"!=typeof t.key||!t.key)throw new Error("Invalid trigger key "+t.key);if(t.prevChild===o.undef)throw new Error("Triggers must provide a valid prevChild value for child_added and child_moved events");break;case"child_removed":case"child_changed":if("string"!=typeof t.key||!t.key)throw new Error("Invalid trigger key "+t.key);break;default:throw new Error("Invalid trigger event type: "+t.event)}}function s(t){return t instanceof a?t._snaps.slice():o.isArray(t)?t.slice():[t]}var o=t("../../common"),a=t("./NormalizedSnapshot.js");r.prototype.create=function(t){var e;return e="value"===this.event?new a(t,this.snaps):new a(t.ref().child(this.key),this.snaps)},r.prototype.toString=function(){return o.printf("SnapshotFactory(event=%s, key=%s, numberOfSnapshots=%s, prevChild=%s",this.event,this.key,this.snaps.length,this.prevChild===o.undef?"undefined":this.prevChild)},e.exports=r},{"../../common":25,"./NormalizedSnapshot.js":8}],17:[function(t,e,i){"use strict";var r=t("../../common"),n=t("./PathManager"),s=t("./Path"),o=t("./FieldMap"),a=t("./RecordSet");e.exports={replicate:function(t,e){var i=t.getPathManager().getPaths().slice(0),h=i[0];i[0]=new s([e,h.name(),h.getDependency()]);var u=new n(r.map(i,function(t){return t.clone()})),c=new o(u);t.getFieldMap().forEach(c.add,c);var l,f=t.getClass();return l=f===a?new f(c,t.filters):new f(c)}}},{"../../common":25,"./FieldMap":4,"./Path":9,"./PathManager":10,"./RecordSet":14}],18:[function(t,e,i){"use strict";function r(t,e,i){var r=s.extend({},u,t);return r.maxCacheSize||(r.maxCacheSize=3*r[e]),n(r,e,i),n(r,"maxCacheSize",i),r}function n(t,e,i){if("number"!=typeof t[e])throw new Error("Argument "+e+" passed into opts for "+i+"must be a number")}var s=t("../common"),o=t("./libs/Scroll.js"),a=t("./libs/Paginate.js"),h=t("./libs/ReadOnlyRef.js"),u={field:null,pageSize:10,windowSize:250};i.Scroll=function(t,e,i,n){if(!s.isFirebaseRef(t)||s.isQueryRef(t))throw new Error("First argument to Firebase.util.Scroll must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).");if("string"!=typeof e)throw new Error("Second argument to Firebase.util.Scroll must be a valid string");if(arguments.length>2&&!s.isObject(i))throw new Error("Optional third argument to Firebase.util.Scroll must be an object of key/value pairs");var a=new h(t);return a.scroll=new o(a,e,r(i,"windowSize","Scroll"),n),a},i.Paginate=function(t,e,i){if(!s.isFirebaseRef(t)||s.isQueryRef(t))throw new Error("First argument to Firebase.util.Paginate must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).");if("string"!=typeof e)throw new Error("Second argument to Firebase.util.Paginate must be a valid string");if(arguments.length>2&&!s.isObject(i))throw new Error("Optional third argument to Firebase.util.Paginate must be an object of key/value pairs");var n=new h(t);return n.page=new a(n,e,r(i,"pageSize","Paginate")),n}},{"../common":25,"./libs/Paginate.js":21,"./libs/ReadOnlyRef.js":22,"./libs/Scroll.js":23}],19:[function(t,e,i){"use strict";function r(t,e,i,r){n.log.debug("Cache: caching %s using field=%s maxRecordsLoaded=%d",t.toString(),e,i),this.offset=new s({field:e,max:i,ref:t.ref()}),this.outRef=t,this.inRef=null,this.queryRef=null,this.countRef=null,this.keys={},this.start=0,this.count=-1,this.endCount=-1,this.nextListeners=[],this.offset.observe(this._keyChange,this),this.desc=r}var n=t("../../common"),s=t("./Offset");r.prototype.moveTo=function(t,e){n.log.debug("Cache.moveTo: startOffset=%d, numberOfRecords=%d",t,e);var i=this.start,r=this.count;this.start=t,this.count=e,this.endCount=this.start+this.count,i!==this.start?this.offset.goTo(t,e):r!==this.count&&this._refChange()},r.prototype.hasNext=function(){return this.count===-1||this.endCount>this.start+this.count},r.prototype.hasPrev=function(){return this.start>0},r.prototype.observeHasNext=function(t,e){var i=this.nextListeners,r=[t,e];return i.push(r),function(){n.remove(i,r)}},r.prototype.destroy=function(){this._unsubscribe(),this.offset.destroy(),this.offset=null,this.start=0,this.count=-1,this.inRef=null,this.outRef=null,this.queryRef=null,this.countRef=null,this.keys=null,this.nextListeners=null},r.prototype._keyChange=function(t,e,i){this.inRef=i,n.log.debug("Cache._keyChange: %s %s %s",t,e,i.toString()),this._refChange()},r.prototype._unsubscribe=function(){this.queryRef&&(this.queryRef.off("child_added",this._add,this),this.queryRef.off("child_removed",this._remove,this),this.queryRef.off("child_moved",this._move,this),this.queryRef.off("child_changed",this._change,this),this.queryRef.off("value",this._value,this),this.queryRef.off("value",this._removeOrphans,this),this.queryRef=null),this.countRef&&(this.countRef.off("value",this._count,this),this.countRef=null)},r.prototype._refChange=function(){this._unsubscribe(),this.inRef&&this.count>-1&&(this.countRef=this.desc?this.inRef.limitToLast(this.count+1):this.inRef.limitToFirst(this.count+1),this.countRef.on("value",this._count,this),this.queryRef=this.desc?this.inRef.limitToLast(this.count):this.inRef.limitToFirst(this.count),this.queryRef.on("child_added",this._add,this),this.queryRef.on("child_removed",this._remove,this),this.queryRef.on("child_moved",this._move,this),this.queryRef.on("child_changed",this._change,this),this.queryRef.on("value",this._value,this),this.queryRef.once("value",this._removeOrphans,this))},r.prototype._add=function(t,e){var i=t.key();n.has(this.keys,i)?n.isEqual(this.keys[i],t.val())||this._change(t):(this.keys[i]=t,this.outRef.$trigger("child_added",t,e))},r.prototype._remove=function(t){var e=t.key();n.has(this.keys,e)&&(this.outRef.$trigger("child_removed",t),delete this.keys[e])},r.prototype._move=function(t,e){var i=t.key();n.has(this.keys,i)&&(this.keys[i]=t,this.outRef.$trigger("child_moved",t,e))},r.prototype._change=function(t){this.keys[t.key()]=t,this.outRef.$trigger("child_changed",t)},r.prototype._value=function(t){this.outRef.$trigger("value",t)},r.prototype._count=function(t){this.endCount=this.start+t.numChildren();var e=this.hasNext();n.each(this.nextListeners,function(t){t[0].call(t[1],e)})},r.prototype._removeOrphans=function(t){n.each(this.keys,function(e,i){t.hasChild(i)||(this.outRef.$trigger("child_removed",e),delete this.keys[i])},this)},e.exports=r},{"../../common":25,"./Offset":20}],20:[function(t,e,i){"use strict";function r(t){this.keys=[],this.field=t.field,this.ref=o(t.ref,t.field),this.max=t.max,this.listeners=[],this.curr=0,this.sub=null,this.isSubscribing=!1,this.lastNotifyValue=u.undef,this._debouncedRecache=a(function(){u.log.debug("Offset._debouncedRecache: recaching keys for offset %d",this.curr),this.keys=[],this._grow(this._listen)},this,100,1e3)}function n(t,e){var i;switch(e){case"$key":i=t.key();break;case"$priority":i=t.getPriority();break;case"$value":i=t.val();break;default:var r=t.val();if(!u.isObject(r))throw new Error("A value of type "+typeof r+'Was found. But we are attempting to order by child field "'+e+"\". Pagination requires all records to be objects or it can't determine an appropriate offset value.");i=r[e]}return{val:i,key:t.key()}}function s(t,e){return e===!1?null:null===e?t:t.startAt(e.val,e.key)}function o(t,e){return"$key"===e?t.orderByKey():"$priority"===e?t.orderByPriority():"$value"===e?t.orderByValue():t.orderByChild(e)}function a(t,e,i,r){function n(){if(h&&(h(),h=null),a&&Date.now()-a>r)c||(c=!0,setTimeout(s,0));else{a||(a=Date.now());var t=setTimeout(s,i);h=function(){clearTimeout(t)}}}function s(){h=null,a=null,c=!1,t.apply(e,u)}function o(){u=Array.prototype.slice.call(arguments,0),n()}var a,h,u,c;if("number"==typeof e&&(r=i,i=e,e=null),"number"!=typeof i)throw new Error("Must provide a valid integer for wait. Try 0 for a default");if("function"!=typeof t)throw new Error("Must provide a valid function to debounce");return r||(r=10*i||100),o.running=function(){return a>0},o}function h(t){var e=t.length;return e?t[e-1]:null}var u=t("../../common");r.prototype.goTo=function(t){t!==this.curr&&(u.log("Offset.goTo: offset changed from %d to %d",this.curr,t),this.curr=t,this.lastNotifyValue=u.undef,this._listen())},r.prototype.observe=function(t,e){this.listeners.push([t,e]);var i=this.getKey(),r=s(this.ref,i);t.call(e,i&&i.val,i&&i.key,r)},r.prototype.getKey=function(t){return arguments.length||(t=this.curr),0===t?null:this.keys.length>t&&this.keys[t]},r.prototype.destroy=function(){this._unsubscribe(),this.curr=0,this.keys=[],this.lastNotifyValue=u.undef,this.isSubscribing=!1},r.prototype._notify=function(){var t=this.getKey();if(!u.isEqual(this.lastNotifyValue,t)){u.log("Offset._notify: key at offset %d is %s",this.curr,t&&t.key),this.lastNotifyValue=t;var e=s(this.ref,t);u.each(this.listeners,function(i){i[0].call(i[1],t&&t.val,t&&t.key,e)})}},r.prototype._recache=function(){this.isSubscribing||this._debouncedRecache()};var c=0;r.prototype._grow=function(t){var e=this,i=e.keys.length;if(e.curr>=i){var r=e.getKey(),s=h(e.keys),o=Math.min(e.curr+(s?2:1)-i,e.max),a=null!==s?e.ref.startAt(s.val,s.key):e.ref;a.limitToFirst(o).once("value",function(i){var a=null!==s;if(i.forEach(function(t){return a?void(a=!1):void e.keys.push(n(t,e.field))}),c++>1e4)throw new Error("Tried to fetch more than 10,000 pages to determine the correct offset. Giving up now. Sorry.");e.curr>=e.keys.length&&i.numChildren()===o?setTimeout(u.bind(e._grow,e,t),0):(c=0,u.log.debug("Offset._grow: Cached %d keys",e.keys.length),t.call(e,!u.isEqual(e.getKey(),r)))})}else t.call(e,!1)},r.prototype._startOffset=function(){return Math.max(0,this.curr-this.max,this.curr-10)},r.prototype._queryRef=function(){var t=this._startOffset(),e=this.ref;if(t>0){var i=this.getKey(t);e=e.startAt(i.val,i.key)}return e.limitToLast(Math.max(this.curr-t,1))},r.prototype._moved=function(t){t.key()===this.getKey()&&this._recache()},r.prototype._unsubscribe=function(){this.sub&&(this.sub.off("child_added",this._recache,this),this.sub.off("child_moved",this._moved,this),this.sub.off("child_removed",this._recache,this),this.sub.off("value",this._doneSubscribing,this),this.sub=null)},r.prototype._subscribe=function(){this._unsubscribe(),this.sub=this._queryRef(),this.isSubscribing=!0,this.sub.on("child_added",this._recache,this),this.sub.on("child_moved",this._moved,this),this.sub.on("child_removed",this._recache,this),this.sub.once("value",this._doneSubscribing,this)},r.prototype._doneSubscribing=function(){this.isSubscribing=!1,this._notify()},r.prototype._monitorEmptyOffset=function(){function t(n){var s=n.numChildren();s>(null===r?0:1)&&(u.log.debug("Offset._monitorEmptyOffset: A value exists now."),i.off("value",t),e._grow())}var e=this,i=e.ref,r=null;this.keys.length&&(r=h(this.keys),i=i.startAt(r.val,r.key)),u.log.debug("Offset._monitorEmptyOffset: No value exists at offset %d, currently %d keys at this path. Watching for a new value.",this.curr,this.keys.length),i.limitToFirst(2).on("value",t)},r.prototype._listen=function(){this._unsubscribe(),this.curr>=this.keys.length?this._grow(function(){this.keys.length>=this.curr?this._subscribe():(this._monitorEmptyOffset(),this._notify())}):this._subscribe()},e.exports=r},{"../../common":25}],21:[function(t,e,i){"use strict";function r(t,e,i){this.currPage=0,this.field=e,this.ref=t,this.pageSize=i.pageSize,this.max=i.maxCacheSize,this.subs=[],this.pageChangeListeners=[],this.pageCountListeners=[],this.cache=new a(t,e,i.maxCacheSize),this.pageCount=-1,this.couldHaveMore=!1,this.cache.observeHasNext(this._countPages,this)}function n(t,e){return 0===t?0:Math.ceil(t/e)}function s(t,e){var i={};if(i.bindFunction=function(t,e){return function(){return t.apply(e,[e])}},i.stateChange=function(t){4==i.request.readyState&&i.callbackFunction(i.request.responseText)},i.getRequest=function(){return window.ActiveXObject?new ActiveXObject("Microsoft.XMLHTTP"):!!window.XMLHttpRequest&&new XMLHttpRequest},i.postBody=arguments[2]||"",i.callbackFunction=e,i.url=t,i.request=i.getRequest(),i.request){var r=i.request;r.onreadystatechange=i.bindFunction(i.stateChange,i),""!==i.postBody?(r.open("POST",t,!0),r.setRequestHeader("X-Requested-With","XMLHttpRequest"),r.setRequestHeader("Content-type","application/x-www-form-urlencoded"),r.setRequestHeader("Connection","close")):r.open("GET",t,!0),r.send(i.postBody)}return i}var o=t("../../common"),a=t("./Cache");r.prototype.next=function(){return this.hasNext()&&(this.currPage++,o.log.debug("Paginate.next: current page is %d",this.currPage),this._pageChange()),this},r.prototype.prev=function(){return this.hasPrev()&&(this.currPage--,o.log.debug("Paginate.prev: current page is %d",this.currPage),this._pageChange()),this},r.prototype.setPage=function(t){t>0&&t<=this.pageCount?(this.currPage=t,o.log.debug("Paginate.setPage: current page is %d",this.currPage),this._pageChange()):o.log.warn("Paginate.setPage: invalid page number %d",t)},r.prototype.hasNext=function(){return this.cache.hasNext()},r.prototype.hasPrev=function(){return this.currPage>1},r.prototype.onPageChange=function(t,e){var i=this.pageChangeListeners,r=[t,e];return i.push(r),t.call(e,this.currPage),function(){o.remove(i,r)}},r.prototype.onPageCount=function(t,e){var i=this.pageCountListeners,r=[t,e];return i.push(r),this.pageCount>-1?t.call(e,this.pageCount,this.couldHaveMore):this._countPages(),function(){o.remove(i,r)}},r.prototype.getCountByDowloadingAllKeys=function(t,e){var i=this;i.downloadingEverything=!0;var r=i.ref.ref().toString();r.match(/\/$/)||(r+="/"),r+=".json?shallow=true",s(r,function(r){var s=0;try{s=o.keys(JSON.parse(r)).length}catch(a){o.log.warn(a)}o.log.debug("Paginate.getCountByDownloadingAllKeys: found %d keys",s),i.downloadingEverything=!1,i.pageCount=n(s,i.pageSize),i.couldHaveMore=!1,i._notifyPageCount(),t&&t.call(e,s)})},r.prototype.destroy=function(){this.cache.destroy(),this.cache=null,this.ref=null,o.each(this.subs,function(t){t()}),this.subs=[],this.pageCountListeners.length=0,this.pageChangeListeners.length=0},r.prototype._countPages=function(){var t=this,e=t.currPage;if(!this.downloadingEverything)if(t.pageCount===-1){var i=t.max,r=t.pageSize,n=this.ref.ref().limitToFirst(i);n.once("value",function(e){t.pageCount===-1&&(t.couldHaveMore=e.numChildren()===i,t.pageCount=Math.ceil(e.numChildren()/r),t._notifyPageCount(),t._countPages())})}else e>=t.pageCount&&(t.pageCount=e,t.couldHaveMore=t.cache.hasNext(),t._notifyPageCount())},r.prototype._pageChange=function(){var t=this.currPage,e=(t-1)*this.pageSize;this.cache.moveTo(e,this.pageSize),this._countPages(),o.each(this.pageChangeListeners,function(e){e[0].call(e[1],t)})},r.prototype._notifyPageCount=function(){var t=this.pageCount,e=this.couldHaveMore;o.each(this.pageCountListeners,function(i){i[0].call(i[1],t,e)})},e.exports=r},{"../../common":25,"./Cache":19}],22:[function(t,e,i){"use strict";function r(t){this._ref=t,this._obs=new a.Observable(["value","child_added","child_removed","child_moved","child_changed"])}function n(t){return function(){var e=a.toArray(arguments),i=this.ref();return i[t].apply(i,e)}}function s(t){return function(){throw new Error(t+" is not supported. This is a read-only reference. You can modify child records after calling .child(), or work with the original by using .ref().")}}function o(t){return function(){throw new Error(t+" is not supported for Paginate and Scroll references. 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+},c.contains=function(t,e,i){if("function"!=typeof e){if(c.isArray(t))return c.indexOf(t,e)>-1;e=function(t){return function(e){return e===t}}(e)}return c.find(t,e,i)!==u},c.each=function(t,e,i){if(c.isArrayLike(t))(t.forEach||o).call(t,e,i);else if(c.isObject(t)){var r;for(r in t)t.hasOwnProperty(r)&&e.call(i,t[r],r,t)}},c.indexOf=function(t,e){return(t.indexOf||h).call(t,e)},c.remove=function(t,e){var i=!1;if(c.isArray(t)){var r=c.indexOf(t,e);r>-1&&(t.splice(r,1),i=!0)}else if(c.isObject(t)){var n;for(n in t)if(t.hasOwnProperty(n)&&e===t[n]){i=!0,delete t[n];break}}return i},c.defer=function(t,e){var i=c.toArray(arguments);setTimeout(c.bind.apply(null,i),0)},c.call=function(t,e){var i=c.toArray(arguments,2),r=[];return c.each(t,function(t){return"function"!=typeof t||e?void(c.isObject(t)&&"function"==typeof t[e]&&r.push(t[e].apply(t,i))):r.push(t.apply(null,i))}),r},c.isEqual=function(t,e,i){if(t===e)return!0;if(typeof t!=typeof e)return!1;if(c.isObject(t)&&c.isObject(e)){var r=c.isArrayLike(t),n=c.isArrayLike(e);if(r||n)return r&&n&&t.length===e.length&&!c.contains(t,function(t,i){return!c.isEqual(t,e[i])});var s=i?c.keys(t):c.keys(t).sort(),o=i?c.keys(e):c.keys(e).sort();return c.isEqual(s,o)&&!c.contains(t,function(t,i){return!c.isEqual(t,e[i])})}return!1},c.bindAll=function(t,e){return c.each(e,function(i,r){"function"==typeof i&&(e[r]=c.bind(i,t))}),e},c.printf=function(){var t=c.toArray(arguments),e=t.shift(),i=e.match(/(%s|%d|%j)/g);return i&&t.length&&c.find(i,function(i){return e=e.replace(i,r(t.shift(),i)),0===t.length}),e},c.mergeToString=function(t){return 0===t.length?null:1===t.length?t[0]:"["+t.join("][")+"]"},c.construct=function(t,e){function i(){return t.apply(this,e)}return i.prototype=t.prototype,new i},c.noop=function(){};var f=[];c.isFirebaseRef=function(t){if(!c.isObject(t))return!1;var e=Object.getPrototypeOf(t);return!(!e||e.constructor!==c.Firebase.prototype.constructor)||("function"==typeof t.ref&&"function"==typeof t.ref().transaction||c.isFirebaseRefWrapper(t))},c.isFirebaseRefWrapper=function(t){return c.contains(f,function(e){return t instanceof e})},c.isQueryRef=function(t){return c.isFirebaseRef(t)&&"function"!=typeof t.transaction},c.registerFirebaseWrapper=function(t){f.push(t)},c._mockFirebaseRef=function(t){c.Firebase=t},c.escapeEmail=function(t){return(t||"").replace(".",",")},c.assertValidEvent=function(t){if(!c.contains(l,t))throw new Error("Event must be one of "+l+", but received "+t)},c.inherits=function(t,e){var i=[t.prototype].concat(c.toArray(arguments).slice(2));return t.prototype=new e,t.prototype.constructor=e,c.each(i,function(e){c.each(e,function(e,i){t.prototype[i]=e})}),t.prototype._super=function(){e.apply(this,arguments)},t},c.deepCopy=function(t){if(!c.isObject(t))return t;var e=c.isArrayLike(t)?[]:{};return c.each(t,function(t,i){e[i]=c.deepCopy(t)}),e},c.pick=function(t,e){if(!c.isObject(t))return{};var i=c.isArrayLike(t)?[]:{};return c.each(e,function(e){i[e]=t[e]}),i},c.eachByPath=function(t,e,i,r){var n={};c.each(e,function(e,i){var r=t.pathFor(i),s=t.getField(i),o=s?s.id:i;c.has(n,r.name())||(n[r.name()]={path:r,data:{}}),n[r.name()].data[o]=e}),c.each(n,function(t){i.call(r,t.path,t.data)})}}).call(this,"undefined"!=typeof global?global:"undefined"!=typeof self?self:"undefined"!=typeof window?window:{})},{firebase:"firebase"}],"firebase-util":[function(t,e,i){"use strict";var r=t("./common/index.js");r.extend(i,t("./common/exports.js"),t("./NormalizedCollection/exports.js"),t("./Paginate/exports.js")),"undefined"!=typeof window&&(window.hasOwnProperty("Firebase")?window.Firebase.util=r:console.warn("Firebase not found on the global window instance. Cannot add Firebase.util namespace."))},{"./NormalizedCollection/exports.js":2,"./Paginate/exports.js":18,"./common/exports.js":24,"./common/index.js":25}]},{},[1]);
\ No newline at end of file
diff --git a/package.json b/package.json
index 61b895a..b69a77f 100644
--- a/package.json
+++ b/package.json
@@ -1,7 +1,7 @@
 {
   "name": "firebase-util",
   "description": "A set of experimental power tools for Firebase.",
-  "version": "0.0.0",
+  "version": "0.2.6",
   "author": "Firebase (https://firebase.google.com/)",
   "homepage": "https://github.com/firebase/firebase-util",
   "repository": {
diff --git a/src/Paginate/exports.js b/src/Paginate/exports.js
index 2ea2094..9052c13 100644
--- a/src/Paginate/exports.js
+++ b/src/Paginate/exports.js
@@ -10,7 +10,7 @@ var DEFAULTS = {
   windowSize: 250
 };
 
-exports.Scroll = function(baseRef, sortField, opts) {
+exports.Scroll = function(baseRef, sortField, opts, desc) {
   if( !util.isFirebaseRef(baseRef) || util.isQueryRef(baseRef) ) {
     throw new Error('First argument to Firebase.util.Scroll must be a valid Firebase ref. It cannot be a Query (e.g. you have called orderByChild()).');
   }
@@ -22,7 +22,7 @@ exports.Scroll = function(baseRef, sortField, opts) {
     throw new Error('Optional third argument to Firebase.util.Scroll must be an object of key/value pairs');
   }
   var ref = new ReadOnlyRef(baseRef);
-  ref.scroll = new Scroll(ref, sortField, calcOpts(opts, 'windowSize', 'Scroll'));
+  ref.scroll = new Scroll(ref, sortField, calcOpts(opts, 'windowSize', 'Scroll'), desc);
   return ref;
 };
 
diff --git a/src/Paginate/libs/Cache.js b/src/Paginate/libs/Cache.js
index 50cdb70..9e9a83c 100644
--- a/src/Paginate/libs/Cache.js
+++ b/src/Paginate/libs/Cache.js
@@ -2,7 +2,7 @@
 var util = require('../../common');
 var Offset = require('./Offset');
 
-function Cache(outRef, sortField, maxRecordsLoaded) {
+function Cache(outRef, sortField, maxRecordsLoaded, desc) {
   util.log.debug('Cache: caching %s using field=%s maxRecordsLoaded=%d', outRef.toString(), sortField, maxRecordsLoaded);
   this.offset = new Offset({field: sortField, max: maxRecordsLoaded, ref: outRef.ref()});
   this.outRef = outRef;
@@ -15,6 +15,7 @@ function Cache(outRef, sortField, maxRecordsLoaded) {
   this.endCount = -1;
   this.nextListeners = [];
   this.offset.observe(this._keyChange, this);
+  this.desc = desc;
 }
 
 Cache.prototype.moveTo = function(startOffset, numberOfRecords) {
@@ -87,11 +88,11 @@ Cache.prototype._unsubscribe = function() {
 Cache.prototype._refChange = function() {
   this._unsubscribe();
   if( this.inRef && this.count > -1 ) {
-    this.countRef = this.inRef.limitToFirst(this.count+1);
+    this.countRef = this.desc ? this.inRef.limitToLast(this.count+1) : this.inRef.limitToFirst(this.count+1);
     this.countRef.on('value', this._count, this);
     //todo we should queue all the events until the once('value') is completed
     //todo so that we can trigger removed before added
-    this.queryRef = this.inRef.limitToFirst(this.count);
+    this.queryRef = this.desc ? this.inRef.limitToLast(this.count) : this.inRef.limitToFirst(this.count);
     this.queryRef.on('child_added', this._add, this);
     this.queryRef.on('child_removed', this._remove, this);
     this.queryRef.on('child_moved', this._move, this);
diff --git a/src/Paginate/libs/Scroll.js b/src/Paginate/libs/Scroll.js
index 784c3ec..6d6d238 100644
--- a/src/Paginate/libs/Scroll.js
+++ b/src/Paginate/libs/Scroll.js
@@ -7,11 +7,11 @@ var Cache = require('./Cache');
  * @param {Object} [opts]
  * @constructor
  */
-function Scroll(readOnlyRef, field, opts) {
+function Scroll(readOnlyRef, field, opts, desc) {
   this.max = opts.windowSize;
   this.start = 0;
   this.end = 0;
-  this.cache = new Cache(readOnlyRef, field, opts.maxCacheSize);
+  this.cache = new Cache(readOnlyRef, field, opts.maxCacheSize, desc);
 }
 
 /**