[BUGFIX beta] Upgrade Backburner to 0.2.0
[BUGFIX beta] Ember.onerror now uses Backburner's error handler - #3401
Merge pull request #4562 from emberjs/backburner-upgrade

[BUGFIX beta] Upgrade Backburner, Switch Ember.onerror to Backburner's handler
Revert "[BUGFIX beta] Upgrade Backburner to 0.2.0"

This reverts commit 736effe8343d9fc76447a6584895520e663bb97d.
Revert "[BUGFIX beta] Ember.onerror now uses Backburner's error handler - #3401"

This reverts commit 022c1f624e1a8e010f7134378f991f90c23ac523.
Merge pull request #4565 from rjackson/revert-backburner-update

Revert Backburner update due to Phantom Failures
Merge branch 'master' into trek-es6-ember-application
Down to a single test fail