Updated to ED beta 6 and Ember 1.5 beta 1

Changed the container register in the helper to account for:
https://github.com/emberjs/data/pull/1653/files

Promises are now instantiated and passed an empty anonymous function:
https://github.com/emberjs/ember.js/commit/ea2d13b7e793435b208bdc4286c08673af03c153

Also Switched over to Bower components on the test page to make things a
little easier.

Optional upgrade pull for consideration/reference.

Fair warning.  **This will break the tests on lower versions of Ember Data.**