[WIP] Views hooks 

Setting up an early PR to get some feedback on views hooks.
A sectionView will get rendered using an [Ember.ContainerView](http://emberjs.com/api/classes/Ember.ContainerView.html). I'll create a hook that passes the ContainerView so the callback can instantiate the view and insert itself.

http://emberjs.com/guides/views/manually-managing-view-hierarchy/ 
> That means that you can manipulate the collection of views very expressively, using methods like pushObject, popObject, shiftObject, unshiftObject, insertAt, removeAt, or any other method you would use to interact with an Ember array.

```javascript
Balanced.registerSectionView("customer/details", function(containerView) {
    // do something with containerView
})
```