add Ember.computed.defaultTo
Fix render helper with model when used multiple times
Remove unused variable
Merge pull request #2293 from tricknotes/remove-unused

Remove unused variable
Refactor of Ember.Application's way of resolving objects looked up in the container. These changes allow the app to specify a resolver class and make it possible to plug in alternate approaches or augment the default approaches.
Merge pull request #2287 from lukemelia/pluggable_resolver

Refactor of Ember.Application's way of resolving objects
No longer special case app init for testing:

https://github.com/emberjs/ember.js/blob/master/packages/ember-application/lib/system/application.js#L313 actually makes app boot deterministic.
Fill in a missing test (and fix) for resolving a normal (non-controller or template) object.
Merge pull request #2296 from lukemelia/fix-new-resolver-for-normal-classes

Fill in a missing test (and fix) for resolving a normal (non-controller or template) object.
Merge pull request #2289 from stefanpenner/removeUneededTestingFlags

No longer special case app init for testing:
Added isDestroying/isDestroyed flags meaning and invariants docs.
Enumerable#compact now removes undefined values
Merge pull request #2303 from valentin-nemcev/enumerable-compacts-undefined

Enumerable#compact now removes undefined values
Ensure that all view observers are scheduled

Previously Ember.View#registerObserver did not schedule observers as part of
the 'render' queue. In some cases we implemented an additional 'invoker'
that took care of this but it was not universally applied. Here we move the
scheduling into registerObserver itself. This will help prevent unnecessary
DOM updates.
Merge pull request #2307 from CrowdStrike/scheduled-view-updates

Ensure that all view observers are scheduled
Merge pull request #2217 from opichals/docs-isdestroying-isdestroyed

Added isDestroying/isDestroyed flags meaning and invariants docs.
Add 'name' to attributeBinding for textFeld and select

Added to:

* Ember.TextField
* Ember.TextArea
* Ember.Select
* Ember.Checkbox
Merge pull request #2313 from bcardarella/attr-binding-names

Add 'name' to attributeBinding for form controls
Merge pull request #2274 from darthdeus/fix-render-with-model

Fix render helper with model when used multiple times
Added some return info in api docs.