Install Core Data model files correctly

Added support to compile Core Data model files before adding to the app bundle.
Merge pull request #795 from brutella/master

Add support for Core Data model
Updating the rake version.
Update bundle.
Merge branch 'master' into 0.17

* master:
  Update bundle.
  Updating the rake version.
  Install Core Data model files correctly

Conflicts:
	Gemfile.lock
[Integration] Update copy resources scripts