[BUGFIX beta] pass context to sortFunction to avoid calling __nextSuper on undefined
[Bugfix beta] sync backburner

* no longer deopt during run-loop flush (due to usage of try/catch)
* workaround older IE's lack of "catch" in try/finally statement bug
[FEATURE ember-routing-will-change-hooks] finer-grain transition hooks

Brought to you by @ef4, and demonstrated at his
EmberConf talk:

http://confreaks.com/videos/3302-emberconf2014-animations-and-transitions-in-an-ember-app

See this router.js PR for details:

https://github.com/tildeio/router.js/pull/89
[Bugfix beta] Namespaces are now required to start with uppercase A-Z. Lowercase namespaces were deprecated long ago, and scanning for them was causing issues on certain Android devices.
Merge pull request #4760 from machty/ef4-transition-hooks

[FEATURE ember-routing-will-change-hooks] finer-grain transition hooks
Merge pull request #4738 from kongregate/fix-android-webview-crash

Don't access the webkitNotifications object while processing namespaces....
Merge pull request #4754 from stefanpenner/sync-bb

sync BB
cleanup + jshint
[Feature ember-metal-map-to-array]
Merge pull request #4772 from stefanpenner/map-to-array

[FEATURE ember-metal-map-to-array]
Merge pull request #4678 from sly7-7/quick-fix-sortable

[BUGFIX beta] pass context to sortFunction to avoid calling __nextSuper ...
Revert "[Feature ember-metal-map-to-array]"

This reverts commit c5714d299f2161961c0bce2358650080a3fcaa76.

This implements value not toArray, I was on crack when I wrote this.
[DOC release] Fixed typo
Merge pull request #4775 from wolodarsky/master

[DOC release] Fixed typo
Fix 'helpr' typo in ember-handlebars/lib/ext.js
Merge pull request #4778 from radar/helpr-typo

Fix 'helpr' typo in ember-handlebars/lib/ext.js
Fix typo: sectionAction -> sendAction
Merge pull request #4786 from radar/section-action-typo

Fix typo: sectionAction -> sendAction
Clarify test-run instructions

`es6-module-transpiler` is needed to run the tests, so an `npm install` is needed. Furthermore, users using zsh will have issues with the brackets inside the test command and will need to escape the test command lest they receive the `zsh: no matches found: test[all]` error.
Merge pull request #4788 from robyurkowski/patch-1

Clarify test-run instructions