Updating Polymer app implementation
Addressing feedback
GWT compiled app using eventbus for loose coupling between model & presenter
Merge pull request #887 from dprotti/gwtcleanmodelcompiled

GWT compiled app - eventbus for loose coupling between model & presenter
fix for itemChangedAction code style
Merge pull request #888 from tastejs/polymer-update

Update the Polymer implementation
Fix incorrect path to polymer app bg
Update to Ember 1.5.0-beta.4, updates ember-data also

  * ember 1.5.0-beta.4
  * ember-data 1.0.0-beta.7
  * jquery 2.1.0
  * All tests pass: http://monosnap.com/image/Li8mF3s891Zkoo76yV46BbAqFjs77O