[BUGFIX beta] Allow AST plugins to be registered.
Merge pull request #9925 from rwjblue/htmlbars-split-plugins

[BUGFIX beta] Allow AST plugins to be registered.
[DOC] Remove extra word from beforeModel
Merge pull request #9933 from kimroen/patch-2

[DOC] Remove extra word from beforeModel
[DOC beta] Update README.md for language fix

Update README.md to improve language parallelism in steps in "How to Run Unit Tests"

BEFORE: "Then visit http://localhost:4200/. This will run all tests."
AFTER: "To run all tests, visit http://localhost:4200/."
Merge pull request #9934 from alextsg/patch-1

[DOC beta] Update README.md for language
Removes obsolete files

Seems like it's not needed anymore. If that's not the case, feel free to
close this PR.
Merge pull request #9898 from twokul/obsolete-file

Removes obsolete file
[BUGFIX beta] expose Ember.Backburner

exposes Backburner on Ember for private use by
Ember Data.
Merge pull request #9937 from fivetanley/feature-ember-metal-expose-backburner

[bugfix beta] expose Backburner as Ember.Backburner