update ember-source
Update link_to.js

add description for `disabled` and `disabledWhen` properties for `link-to` handlebar helper.
Adding comments for 'extend()' method

Additional comments

Added comments for Mixins

Added example using Ember.Mixin

Added some description of create() vs extend()
Merge branch 'beta' into stable
Version bump - 1.1.0
Bump VERSION to 1.1.1+pre

This doesn't mean we'll actually ever have a 1.1.1, but any further
commits from the stable branch will become 1.1.1 if released.
VERSION should be 1.1.1+pre not 1.1.0+pre
Use correct ember-source version in Gemfile.lock
[BUGFIX release] Allow Ember.Object.create to accept an Ember.Object.

Also, adds an assertion if the passed in value is not an object or
instance of `Ember.Object`.

Resolves #3596.
[BUGFIX release] Better fix for Ember.Object.create

See #3596, #3597
Whitespace
Bump to 1.1.1
Change VERSION for 1.1.2+pre
Refactor `Ember.Application.initializer`.

Previously, `Ember.Application.initializers` was implemented as a
concatenated property, which is works at class definition and instance
creation time, but not when the field is mutated, which is what
`Ember.Application.initializer` was doing prior to this commit.

Also reverted concatenatedProperties change, which had been added to try
unsuccessfully to address this issue.
Bump to 1.1.2
Change VERSION to 1.1.3+pre
Updated documentation for Ember.Object init method

No need to call ```this._super()``` when extending Ember.Object. Like it says in the "NOTE" :-)
Updated the docs for Ember.Route.activate() to show that it happens on every enter, and not just the first time.
[DOC release] Fix template lookup documentation.

The previous documentation suggested that an `Ember.View` could specify
its `templates` property to be used for template lookup instead of using
`Ember.TEMPLATES`.

This fixes the documentation to reflect what we are actually doing for
template lookup.
Update for Handlebars 1.1