[BUGFIX Beta] New error stack trace

Given this code:

```javascript
export default Ember.Route.extend({
  model: function() {
    return [];
  },
  setupController: function IndexRouteSetupController() {
    throw new Error('Y U SO BROKE');
  }
});
```

New stack trace (chrome):
![app 2013-12-08 22-37-00](https://f.cloud.github.com/assets/1131196/1702178/9236238a-6085-11e3-920b-f6c9cc4881d9.jpg)

New stack trace points you to the exact line in your code (ES6 module) which caused an error to occur. We can also change the stack trace size in any way we want.

Related [PR](https://github.com/emberjs/ember.js/pull/3830).

/cc @machty @rjackson