document some ember-testing helpers
In mid-transition, `modelFor` accepts both camelCase and underscore naming

With facelift router, `modelFor` maintains backwards compatibility
to return a resolved model on a parent route even in mid-transition.
This PR fixes a bug where only the underscore version of a route name
yielded a value in mid transition.
Fix to support jQuery 1.7
Ember.Control add inline docs
 Ember.Select mark 0 as selected value (bugfix for #2763)
Merge pull request #2856 from tricknotes/fix-to-support-jquery-1.7

Fix to support jQuery 1.7
Merge pull request #2860 from teddyzeenny/ember-control

Ember.Control add inline docs
`control` helper more resilient.

Do not install model observers when `modelPath` is undefined.  An alternative
approach would be to default `modelPath` to "model".

Fix #2268.
Merge pull request #2863 from hjdivad/fix-2268

`control` helper more resilient.
Trigger parentViewDidChange event. Fixes #2423
Add test for parentViewDidChange event.
Merge pull request #2858 from chrmod/master

Ember.Select mark 0 as selected value
Merge pull request #2855 from machty/model-for-fix

In mid-transition, `modelFor` accepts both camelCase and underscore naming
Remove unnecessary existing check for `Ember`

Now `Ember` is exist when `Ember.deprecate` is called.
Add code comment
Merge pull request #2867 from tricknotes/remove-unnecessary-check

Remove unnecessary existing check for `Ember`
Merge pull request #2868 from tricknotes/add-code-comment

Add code comment
Merge pull request #2864 from xtian/parent-view-did-change

Trigger parentViewDidChange event. Fixes #2423
Tweaks based on @ebryn's feedback

* Rename Control to Component. This avoids conflicts with the existing
  (behind-a-flag) control and is clearer about intent.
* Remove Ember.register to avoid introducing yet-another registration
  mechanism and move the logic into Ember.Handlebars.helper
Refactored `Ember.Route`s teardown mechanism for rendered views. This fixes #2857, previously multiple outlets were not tore down.