fix DeprecatedContainer

It was correctly emiting deprecation warnings, and invoking the correct
container methods, but was not returning there result;
Merge pull request #2621 from stefanpenner/fix_deprecated_container_with_tests

fix DeprecatedContainer
Ember testing update url in visit helper
Merge pull request #2627 from teddyzeenny/visit-url

Ember testing update url in visit helper
Fix language type
Fix value type

These methods treat `Number` value.
Fix argument name

`decrementProperty` should receive argument as `decrement`.
Fix code comment at `Ember.TextField`

This property is `onEvent`.
Merge pull request #2629 from tricknotes/fix-typo-in-code-comment

Fix typos in code comment
Fix Ember.Test.registerHelper test
Revert "Merge pull request #2577 from machty/bubbling-controller-events"

This reverts commit 05686ccce26808da4a1e1247b131c68cfba15486, reversing
changes made to 7387d6723b5a20395dfd041a67633a6101c2259d.
Fixed small typo
Merge pull request #2639 from machty/revert-controller-bubbling-actions

Revert "Merge pull request #2577 from machty/bubbling-controller-events"
Removed duplicate test for normalizeTuple
Makes partial helper only lookup the deprecated template name if the first try is unsuccessful.
Merge pull request #2641 from intuitivepixel/master

Fixed small typo, and simplified comment.
Merge pull request #2643 from machty/dup-tuple-test

Removed duplicate test for normalizeTuple
Fix docs to use extend instead of create when setting observers
Merge pull request #2648 from teddyzeenny/object-observable

Fix docs to use extend instead of create when setting observers
Replace Ember.RunLoop with Backburner.js