changelog does not containing 2.0 breaking changes

[stefanpenner]

i know its extra work, but it would be great to outline what changed and what broke.

[ryanflorence]

Gotta pay more attention to commit subjects. It's just ember data stuff, it was removed, I'll update the readme

[WMeldon]

FWIW, this is what I'm doing in my ember-cli app:

`import request from 'ic-ajax';`

Initializer =
  name: 'preventAjaxOverride'
  before: 'store'
  initialize: ->
    if Em.testing
      DS.RESTAdapter.reopen
        ajax: (url, type, options) ->
          options = @ajaxOptions url, type, options
          request options

`export default Initializer`