_locate *could* validate locale object

[grawk]

https://github.com/krakenjs/file-resolver/blob/master/index.js#L32

If something is wrong with the locale object, for example it is an empty object {} then _locate will pass non-string arguments to path.join resulting in:

TypeError: Arguments to path.join must be strings
   at path.js:360:15
   at Array.filter (native)
   at Object.exports.join (path.js:358:36)
   at Object.proto._locate (/Users/medelman/src/krakex/kraken-examples/with.i18n/node_modules/engine-munger/node_modules/file-resolver/index.js:32:29)

Not sure if this would be considered over-protective of the module or not...

[aredridel]

Yeah, that would make sense to suppress -- that's not a class of error it should be emitting.