render helper with context, now creates the controller
with its model, rather than setting the model post creation.

Setting the context post creating causes unneeded and wasteful change events.

@hjdivad & @stefanpenner
remove Ember.alias as it has been deprecated since 2013-01-08
Merge pull request #3880 from stefanpenner/remove-ember-alias

remove Ember.alias as it has been deprecated since 2013-01-08
Merge pull request #3878 from stefanpenner/fix-render-helper

render helper with context, now creates the controller