[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
[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 #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 ...