tests on chained helpers
added ember-testing for running in qunit
Correction in test description
Merge pull request #2574 from marcioj/master

Correction in test description
Merge pull request #2569 from sly7-7/ember-testing-tests

add few dummy tests on ember-testing
Make wait a promise and a helper
Merge pull request #2576 from teddyzeenny/wait

Make wait a promise and a helper
cleanup ember-test tests
remove EMBER_APP_BEING_TESTED global
Merge pull request #2578 from stefanpenner/clean_ember_testing

cleanup ember-test tests
Fix CollectionView.arrayDidChange documentation

CollectionView.arrayDidChange arguments have changed wihout
documentation changes. This commit fixes this method documentation.
Merge pull request #2579 from karlguillotte/collection-view-docs

Fix CollectionView.arrayDidChange documentation
fix rejecting a deferred with itself
cleanup deferred tests
Merge pull request #2580 from stefanpenner/master

fix rejecting a deferred with itself
Deferred self rejection does not need special handling
Merge pull request #2581 from teddyzeenny/deferred-rejection

Deferred self rejection does not need special handling
Revert "Merge pull request #2563 from ef4/render-optimization"

This reverts commit 082a9870b176113eada12ba71ed83dd9de2ed702, reversing
changes made to 68fc7fc08ef6d553b8e01c6972040be6e0655cd4.
Adding regression test
Make router's render idempotent

This change prevents us from tearing down and recreating a view when
the new view is functionally identical to the old view.

This has important benefits:

 - when you're changing context within a route, the view itself
   remains stable, and the controller has full control over how and
   when to update the data it's presenting to the view
   layer. (Previously, you got a forced re-render immediately whether
   you were ready for it or not.)

 - when you're changing between routes, you can decide to keep the
   prior view in place, and replace it later when you're ready. (Think
   animated transitions between routes.)

This supercedes the proposed changes in PR #2563 (which has already
been reverted).
Clean up pendingDisconnections propertly