Update CONTRIBUTING.md

fix typo
Merge pull request #2169 from craigteegarden/patch-1

Update CONTRIBUTING.md
Merge pull request #2168 from gavacho/fix-docs

Fixed formatting in jsdoc block for Ember.NativeArray
Add support for global mutation listeners
Methods which return arrays created within them should call Ember.A
remove unused function
check jQuery before extending it
use ember polyfill not jQuery
check document before shy test
Split out vendored handlebars.js in favor of using
a version of handlebars.js wrapped in the
handlebars-source gem.

Also created ember-source.gemspec
as an analogue to to handlebars-source that will wrap
all /dist ember distros.
Merge pull request #2137 from machty/handlebars-source

Split out handlebars from ember-template-compiler; now we use handlebars...
document the create method in for subclasses of Ember.Object
Merge pull request #2175 from fivetanley/document-create

document the create method in for subclasses of Ember.Object
document the init function for Ember.CoreObject
remove redundant example and fix nonsensical grammar
Merge pull request #2174 from fivetanley/document-init

document the init function for Ember.CoreObject
Fix issue where classNameBindings can try to update removed DOM element.

Ember.View#registerObserver now uses states to invoke observers only when there is an element for them to operate on. This avoids a class of issues that can arise when observers are triggered even though the element has been removed from the DOM.
Merge pull request #2185 from lukemelia/avoid-addClass-on-null-element

Fix issue where classNameBindings can try to update removed DOM element.
[fixes #2189] #render was declared as @method action
Merge pull request #2193 from stefanpenner/master

[fixes #2189] #render was declared as @method action