Merge pull request #2602 from mixonic/explicit-version-matching

More accurate, helpful error message for handlebars version errors.
Don't add disabled class if disabledWhen not provided
Merge pull request #2607 from bradleypriest/disabledWhen

Don't add disabled class if disabledWhen not provided
Improve {{render}} docs.

Updated to clarify the different behavior when passing a single argument
versus two arguments.
Merge pull request #2609 from lukemelia/improve-render-docs

Improve {{render}} docs.
Remove duplicated test.
Update variable names in a test for #each to be less confusing.

This test has nothing to do with the itemController option.
Create Ember.Test with registerHelper method
Add onInjectHelpers method
Include `Ember::VERSION` in 'ember-source' gem

For examples:

``` ruby
require 'ember/source'

Ember::VERSION #=> "1.0.0-rc3"
```
Use helper function

`append` is defined for append `checkboxView` to '#qunit-fixture'.
Stop unnecessary `jQuery.fn` extension

I replaced jQeury methods to helper functions.
Make parentController available from an itemController

When using the `{{#each}}` helper with itemController specified,
the itemController instances will now have the parentController
set on them. The parentController is the value of the `controller`
keyword when the #each helper executes.

If ArrayController is used directly with the itemController property
set, the itemController instances will get the ArrayController instance
as their parentController property.
Fix warning message

The argument of `Ember.String.fmt` should be an array.
Merge pull request #2616 from tricknotes/fix-warning-message

Fix warning message
Merge pull request #2612 from tricknotes/stop-unnecessary-object-extension

Stop unnecessary `jQuery.fn` extension
Merge pull request #2615 from tricknotes/include-ember-version

Include `Ember::VERSION` in 'ember-source' gem
Merge pull request #2613 from tricknotes/use-helper-function

Use helper function
bump RSVP (it now has RSVP.reject)
Merge pull request #2618 from stefanpenner/upgrade_rsvp

bump RSVP (it now has RSVP.reject)