Raise an error when attempting to merge an Array from mergedProperties
Make blockHelperMissing a no-op

In Handlebars 2.0, blockHelperMissing is only used for Mustache compatibility.
Merge pull request #9402 from mmun/noop-block-helper-missing

Make blockHelperMissing a no-op
[DOC beta] Fix isEmpty description
Merge pull request #9404 from cxfree/isempty-description-fix

[DOC beta] Fix isEmpty description
Remove DAG implementation.

As of https://github.com/emberjs/ember.js/pull/5677 the DAG is pulled in
from Bower, this file is no longer needed.
Refactor Ember.platform.

Split various polyfils into separate files.  This will ultimately be
pulled into 1.8 beta series.
[BUGFIX beta] Only tests mandatory-setter in ES5 browers.
[BUGFIX beta] Remove trailing commas for old IE.
Merge pull request #9405 from rwjblue/dag-leftovers

Remove DAG implementation.
Merge pull request #9407 from rwjblue/fix-tests-for-es3

[BUGFIX beta] ES3 browser fixes.
Merge pull request #9406 from rwjblue/refactor-platform

Refactor Ember.platform.
Ensure consistent use of Ember.create.
Merge pull request #9408 from rwjblue/use-ember-create

Ensure consistent use of Ember.create.
[BUGFIX release] Enable testing of production builds.

Update the build process to emit `ember-testing.js` which contains the
`ember-debug` and `ember-testing` packages.  This file can be include
when running tests against production builds of Ember (`ember.prod.js`).
[BUGFIX beta] Remove use strict mode for Object.create usage.

Work around the bug identified in https://bugs.webkit.org/show_bug.cgi?id=138038,
by removing `'use strict';` from modules where `Object.create` is called
directly (in the case of `Ember.CoreObject` this occurs after inlining).
Merge pull request #9410 from rwjblue/remove-use-strict

[BUGFIX beta] Remove use strict mode for Object.create usage.
[BUGFIX beta] Fix isEmpty for map
Merge pull request #9414 from mixonic/isEmpty-map

[BUGFIX beta] Fix isEmpty for map
Merge pull request #9411 from rwjblue/emit-ember-testing

[BUGFIX release] Enable testing of production builds.