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.
add Ember.computed.defaultTo
Reuse path variable
Refactor normalization
Merge pull request #2152 from darthdeus/fix-normalization

Refactor normalization
Merge pull request #2151 from caligo-mentis/reuse_variable

Reuse path variable in Ember.HashLocation
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
Methods which return arrays created within them should call Ember.A
remove unused function
check jQuery before extending it