Refactor the Install Generator a tad.
Refactor the Install Generator a tad.

* Prefer global rescue to begin/rescue.
* short circuit return instead of unless block.
* extract ember-data channel to a method.
* condense ember/ember-data file fetching to one method.
* move private declaration to correct indentation.

DavyJonesLocker/ember-appkit-rails,DavyJonesLocker/ember-appkit-rails