Destroying a view no longer destroys that view's container. [Ticket #2531689] Pass {remove: true} to the view's destroy() method to destroy the container as well. This change required a few changes to Y.App to maintain its expected behavior.

Add test to ensure that view-node-map cleans up its references.

Add Y.View.NodeMap extension. Provides getByNode() for View subclasses. [Ticket #2531373]