The content property of an ArrayProxy instance should be defined before modifying it
Add hooks to containerView.

It helps in some cases where we need to implement some special behavior
on outlet connection.
We add four new methods to containerView :
`presentCurrentView` and `dismissCurrentView`
`appendCurrentView` and `removeCurrentView`

In cases where we need some special handeling like animations you can
override theus methods

Add willAppear / willDisappear and didAppear / didDisappear

Refactor so it would be easier to override presentCurrentView / dismissCurrentView
Fix State.transitionTo to handle multiple contexts

Allows multiple contexts to be passed to Ember.State.transitionTo either as multiple arguments or as an array of contexts within an event.

Changed StateManager.send and sendRecursively to allow multiple context arguments.
Calling removeListener without method should remove all listeners
A listener registered with one can be removed with off
fix api typo and rename findStatesByPath to getStatesInPath

findStatesByPath was incorrectly documented as findStateByPath.
The method has been renamed for consistency with the singular
form getStateByPath, and the code itself has been modified slightly
to be more idiomatic with the rest of the state manager.
Fix for popstate firing on page load.
Add Ember.Deferred mixin which implements Promises/A spec
Remove ember-views dependency from ember-states

Ember-views is now an optional dependency for ember-states.  It is only required in the test file.
check if removed observer keeps firing
Don't attempt to concat a concatenatedProperty onto an object that doesn't have a concat method
Better 'rake test' output
Merge pull request #1406 from tchak/deferred-then

Add Ember.Deferred mixin which implements Promises/A spec
Remove ember-views dependency from test suite, stub the Event.

For the purposes of the test suite Ember.$.Event is required to exist.  We can just use an empty function rather than requiring all of ember-views.
Merge pull request #1354 from bestcroftington/master

Allow State.transitionTo handle multiple contexts
Fix trailing comma and whitespace
Remove dependency on `window` throughout Ember

Previously, Ember used the `window` object for
three concerns:

* `imports`: libraries that Ember requires in
  order to work, such as `jQuery`, `Handlebars`,
  and `Metamorph`
* `exports`: the variables that Ember itself
  exports (`Ember` and `Em`)
* `lookup`: the global lookup path for application
  code (e.g. when used in Handlebars templates).

Now, these three concerns are looked up on
`Ember.imports`, `Ember.exports` and
`Ember.lookup` respectively.

For convenience, all three of these are assigned
to `window` by default.

You can change the defaults by assigning a new
Ember object before loading Ember:

```javascript
var imports = {
  Handlebars: Handlebars,
  Metamorph: Metamorph,
  jQuery: jQuery
};

var exports = {}, lookup = {};

Ember = {
  imports: imports,
  exports: exports,
  lookup: lookup
}
```

You can use this to package Ember for external
module loaders like AMD:

```javascript
define("Ember",
  ["exports",
   "App",
   "handlebars",
   "metamorph",
    "jQuery"],
  function(exports, App, Handlebars, Metamorph, jQuery) {
    var imports = {
      Handlebars: Handlebars,
      Metamorph: Metamorph,
      jQuery: jQuery
    };

    var Ember = {
      imports: imports,
      exports: exports,
      lookup: { App: App }
    }

    // distributed ember.js
  });

define("App", [], function() {
  return {};
});

define("Post",
  ["App", "Ember"],
  function(App, Ember) {
    App.Post = Ember.Object.extend({
      // stuff
    });
  });
```

You can use a similar technique to package Ember
Runtime for Node or other environments with
CommonJS-style modules.
Merge pull request #1198 from tchak/container-view-hooks

Container view hooks
Merge pull request #1388 from tchak/events-off

Calling removeListener without method should remove all listeners
Merge pull request #1425 from ghempton/fix-popstate

Fix for popstate firing on page load.