Update heading in Controller doc.
Allow Container's `acceptType` config to be a string type name as well as a constructor function.
Add ModelBindable class.
Change CollectionBindable's class creation from `new Class` to `Class.create`.
Add `getCollection()` to jqc.util.CollectionBindable, and `getModel()` to jqc.util.ModelBindable.
Have jqc.view.Model use the new jqc.util.ModelBindable class.

Also remove getCollection() method from jqc.view.Collection, as it is now in jqc.util.CollectionBindable.