Revert "[Feature ember-metal-map-to-array]"

This reverts commit c5714d299f2161961c0bce2358650080a3fcaa76.

This implements value not toArray, I was on crack when I wrote this.
[DOC release] Fixed typo
Merge pull request #4775 from wolodarsky/master

[DOC release] Fixed typo
Fix 'helpr' typo in ember-handlebars/lib/ext.js
Merge pull request #4778 from radar/helpr-typo

Fix 'helpr' typo in ember-handlebars/lib/ext.js
Fix typo: sectionAction -> sendAction
Merge pull request #4786 from radar/section-action-typo

Fix typo: sectionAction -> sendAction
Clarify test-run instructions

`es6-module-transpiler` is needed to run the tests, so an `npm install` is needed. Furthermore, users using zsh will have issues with the brackets inside the test command and will need to escape the test command lest they receive the `zsh: no matches found: test[all]` error.
Merge pull request #4788 from robyurkowski/patch-1

Clarify test-run instructions
[DOC Beta] New behaviour with itemController

This [BUGFIX beta - Ensure context is unchanged when using keywords with itemController.](https://github.com/emberjs/ember.js/pull/4636) changed the way `itemController` behaves inside `#each` helper. I had problems making it work out because documentation doesn't clear this out and I had to debug it.

These two JsBins describe what changed from the developer using `#each` helper with `itemController`.

- [JsBin with Ember (1.5.1)](http://jsbin.com/ucanam/4838/edit) -> we can call itemController's property without prepending `person`

- [JsBin with Ember (1.6.0-beta.3)](http://jsbin.com/ucanam/4837/edit) -> if we don't prepend `person` for itemController's property we won't get result
Merge pull request #4802 from zigomir/patch-2

[DOC Beta] New behaviour with itemController
[BUGFIX beta] Don't fire redirect on parent routes

We've decided this is just going to be merged
into beta, not release.

Closes #4692
Fix small code styling inconsistencies with CONTRIBUTING.md
Fix issue with Travis using 2.1.0.
Merge pull request #4809 from dentuzhik/fix-styling

Fix small code styling inconsistencies with CONTRIBUTING.md
More Travis shenanigans.
Merge pull request #4796 from machty/parent-redirect

[BUGFIX release] Don't fire redirect on parent routes
[BUGFIX beta] Use controller keywords to get the current context controller