unbound helper supports bound helper static strings
[BUGFIX beta] Do not use ENV if EmberENV exists.

This allows the use of `ENV` in your application without having Ember
hijack it for its uses.

To avoid using `window.ENV`, but still provide customization to Ember's
boot process you could use something like the following:

```javascript
ENV = 'DO NOT USE ME!!!!';

EmberENV = {DISABLE_RANGE_API: true};
```
[DOC beta] minor doc fix
Merge pull request #4020 from twokul/onload-doc-fix

[DOC beta] Minor doc fix
[DOC beta] Make `Ember.computed.collect` visible in docs
Merge pull request #4021 from pangratz/add_doc/computed_collect

[DOC beta] Make `Ember.computed.collect` visible in docs
Merge pull request #3947 from rjackson/do_not_use_global_env

[BUGFIX beta] Do not use ENV if Ember.ENV exists.
[DOC beta] Move @private declaration to correct section.

YUIDoc expects the main documentation to be before any YUIDoc tags. If a
documentation block starts with `@private` the actual documentation will
be ignored, and only the method/property signature will be displayed.

Example before:

![screenshot](https://www.monosnap.com/image/p8SFHLweO2IhI2aEabdyWecMh.png)

Example after:

![screenshot](https://www.monosnap.com/image/1suooi03wXKnL2140YZn5ogTQ.png)
Merge pull request #4022 from rjackson/move_private_declaration

[DOC beta] Move @private declaration to correct section.
[BUGFIX beta] Ensure that ember-debug uses EmberENV.

This brings `ember-debug` in sync with the way `packages/ember-metal/lib/core.js`
pulls in `Ember.ENV`.

See https://github.com/emberjs/ember.js/pull/3947 for more info.
[BUGFIX release] Failing tets for Ember.keys when MANDATORY_SETTERS = true
[BUGFIX release] Failing tests with observers
[BUGFIX release] Make sure mandatory setters don't change default enumerable
fix intermediateTransitionTo doc typos
Merge pull request #4026 from g13013/doc_fix

fix intermediateTransitionTo doc typos
Merge pull request #3788 from alan-andrade/bugfix-object_keys

#3691 Em.keys() behaves differently in production
Merge pull request #4028 from lukemelia/render-parentcontroller

[BUGFIX beta] Make `{{render...}}` set a `parentController` property
[DOC beta] minor fix
Merge pull request #4029 from twokul/join-doc-fix

[DOC beta] minor fix
[BUGFIX beta] Enable building on Windows.

Updates `ember-dev` to 87bc39887fdd1fb7332bebad0c91b57fedef059f.

Fixes https://github.com/emberjs/ember.js/issues/4027.

Thanks to @brzpegasus for tracking this down!