Use quoted action names.

Actions can now use bound property lookup (instead of being static
strings).

This was added in https://github.com/emberjs/ember.js/pull/3936.
Merge pull request #174 from rjackson/use-quoted-actions

Use quoted action names.
Merge branch 'master' of https://github.com/spav/ember-appkit-rails

* 'master' of https://github.com/spav/ember-appkit-rails:
  Use quoted action names.