add Ember.computed.defaultTo
Update Gemfile.lock
Handle 'undefined' element properties - Fixes #2170
Update assert message for model hook in Ember.Route
Update ember-dev to fix tests
use charAt() instead of brackets to access string character
IE7 does not support bracket access to string characters and errors:
http://stackoverflow.com/questions/5943726/string-charatx-or-stringx
Added documentation to the append method

I know it's stated on the `rootElement` but I feel re-iterating it here is also helpful.

Fixed typo
extract Ember.isEmpty into ember-metal

Ember computed.empty should always have identical semantics
Add Ember.computed.none… none + empty have different secants.

Also extract Ember.isNone into ember-metal
Ember.isArray implementation lives in ember-metal, its tests should also

Add test of Ember.isArray against an arrayProxy.
Stop using extended method

I used `Ember.String.fmt` instead of `String#fmt`.
Because the latter may be undefined.
Fix failing test

This package couldn't be required from test.
Better HistoryLocation popstate handling - Fixes #2234
Fix 'rake test[built]' task
Added Campfire notifications to Travis
Remove apparently inactive travis upload hook
Only notify Campfire when build status changes
Updated {{outlet}} documentation to reflect rc1 API for issue #2143
Better warning for missing initializers - Fixes #1906
semicolons