Fixed for ember 1.8

This works with ember 1.8, and I believe should work for older versions as well, since I am using all built in types/etc.


I confirmed that willDestroyElement and didInsertElement get called on the children appropriately.

The collection view interface uses an itemViewClass, ideally ember-cloaking would use the same api, I jsut use the alias as the default, but people who have overridden it, it should will work.