Revert "Merge pull request #2577 from machty/bubbling-controller-events"

This reverts commit 05686ccce26808da4a1e1247b131c68cfba15486, reversing
changes made to 7387d6723b5a20395dfd041a67633a6101c2259d.
Fixed small typo
Removed duplicate test for normalizeTuple
Fix docs to use extend instead of create when setting observers
Replace Ember.RunLoop with Backburner.js
Added test