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: ![5330afc600779133610fc942](https://f.cloud.github.com/assets/2023/2506155/6132620a-b3a3-11e3-8ae0-09e4fbe91d31.png)