[beta] Use documentElement instead of body for ember-extension detection
[DOC beta] Add note about using `{{#with as}}`
[DOC beta] Docs for over-riding default behavior in `setupController`
Merge pull request #4446 from bradfol/setup-controller-doc

[DOC beta] Docs for over-riding default behavior in `setupController`
Merge pull request #4440 from bradfol/with-as-doc

[DOC beta] Add note about using `{{#with as}}`
[DOC] Array docs should reference concrete classes
Addresses #4225
Merge pull request #4448 from bradfol/array-proxy

[DOC] Array docs should reference concrete classes
[FEATURE string-parameterize] Revert feature.

During the weekly core team meetings this feature has been determined to
be a better fit for an external plugin.
[FEATURE ember-testing-simple-setup] Revert feature.

During the weekly core team meetings it was decided that while the
intentions were good, this feature is really just covering up the real
issue but not addresing the underlying problem.
Merge pull request #4418 from teddyzeenny/document-element

Use documentElement instead of body for ember-extension detection
Merge pull request #4452 from rjackson/revert-string-parameterize

[FEATURE string-parameterize] Revert feature.
Merge pull request #4453 from rjackson/revert-ember-testing-simple-setup

[FEATURE ember-testing-simple-setup] Revert feature.
Update CHANGELOG for 1.5.0-beta.3.
Remove unused distros from Assetfile.

This takes `rake dist` from 25 seconds to 13 seconds.
Merge pull request #4455 from rjackson/remove-stupid-crappola-from-assetfile

Remove unused distros from Assetfile.
Speed up sendEvent by using direct function calls and `call` instead of `apply` where possible
Revert "Remove unused distros from Assetfile."

This reverts commit 247c9d0ecaa00b398eb0112c6ce1e326903ecaa3.
Merge pull request #4456 from rjackson/revert-removal-of-distros

Revert "Remove unused distros from Assetfile."
start moving ember-metal to es6
move even more ember-metal files toward es6!