[BUGFIX beta] Make Ember.RenderBuffer#addClass work as expected.
Pre-fill the ember.js tag in the SO link

Also change StackOverflow to Stack[space]Overflow, see the any page title or footer for proof.
Merge pull request #4274 from neeklamy/patch-1

Pre-fill the ember.js tag in the SO link
Merge pull request #4140 from ctimmerm/renderbuffer-addclass

[BUGFIX beta] Make Ember.RenderBuffer#addClass work as expected.
[BUGFIX beta] Deprecate quoteless action names.

This is preparation for enabling the `ember-routing-bound-action-name`
feature.
[FEATURE ember-runtime-test-friendly-promises]
Merge pull request #4176 from stefanpenner/friendly-promise-testing

[FEATURE ember-metal-test-friendly-promises]
[DOC beta] Display Ember Inspector hint in Firefox.
Merge pull request #4281 from rjackson/display-inspector-hint-for-firefox

[DOC beta] Display Ember Inspector hint in Firefox.
Merge pull request #4276 from rjackson/deprecate-quoteless-actions

[BUGFIX beta] Deprecate quoteless action names.
[FEATURE query-params-new] Sort QPs make benefit glorious determinism

Syncing route recognizer, closes #4279
Merge pull request #4289 from machty/i-express-myself-with-branch-names

[FEATURE query-params-new] Sort QPs make benefit glorious determinism
[Bugfix BETA] App.destroy resets routes before destroying the container.

While testing it is common to create an App during setup and destroy it during
teardown.  To prevent ordering issues, routes should be destroyed before the
container is destroyed.  This behavior already exists in App.reset but should
also exist in App.destroy.
Merge pull request #4290 from jandet/willDestroy_reset_router

[Bugfix BETA] App.destroy resets routes before destroying the container.
Add a required option to Ember.Select for form validation
Merge pull request #4292 from parrish/required_select

Add a required option to Ember.Select for form validation