[Bug] Select doesn't tear its self down completely

[mike-north]

The following code in the {{md-select}} component registers some listeners when the Materialize javascript is called

this.$('select').material_select();

Anything registered by this code needs to be cleaned up in the component's willDestroyElement hook

[jacobq]

Also note that this material_select will be select in Materialize v1.0.0.