Close #5088 - Fix usage of document.body.contains, check if browser supports this method(ex. ff 3.6)
Deprecate Ember.Set (no, not Ember.set)
Merge pull request #5229 from trek/deprecate-ember-Set

Deprecate Ember.Set (no, not Ember.set)
jshint
Merge pull request #5243 from mixonic/jshint-navigator

jshint
Polyfill contains for older browsers
Merge pull request #5240 from trek/fix-contains-on-older-firefox

[BUGFIX release]  Fix usage of document.body.contains
refactored compare.js
Merge branch 'master' of https://github.com/emberjs/ember.js