Updated bower, component and package json to beta.4

This PR fixes also the warning when trying to install beta.4 using bower.

`bower ember-data#~1.0.0-beta.4 mismatch Version declared in the json (1.0.0-beta.3) is different than the resolved one (1.0.0-beta.4)`

@rjackson probably beta.4 could be retagged?