Remove reference to therubyracer from README.md 

therubyracer doesn't currently work to build ember.js, and this patch removes an instruction to use it.
Use ENV var to disable version logging of used libraries
Merge pull request #2090 from regularfry/master

Patch to avoid bumping into issue #2069
object proxy defines properties that are passed to create that do not exist in the prototype
expose RSVP on the ember namespace
Merge pull request #2162 from stefanpenner/master

Expose RSVP on the Ember namespace
Merge pull request #2155 from javierav/debug

Use ENV var to disable version logging of used libraries
Fixed formatting in jsdoc block for Ember.NativeArray
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
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...