Add a spec that shows how each-* breaks updates on the root model.

[eigood]

each-* copies the model referenced in the binding/view; when doing so, the event listeners attached that model are lost. As such, if the base model gets updated, the clone of the model in each-* doesn't see the changes.

My suggested fix is to add a "clone" method to the adapter.

There are other similar issues in the View class, but those aren't exposed with this spec.