Allow for key changes

[ClickerMonkey]

in putRemoteData - instead of triggering error on key change - detect it and once the key is applied - trigger an event. The model will have to be removed from the all map, models collection, relation collections, and dependents maps and then added back with the new $$key. Maybe instead of removing and adding back (in the case of collections) add an updateKey(old, new) function.

Add tests that verify relationships update their FK, their dependents map and collection keys should be updated. A ModelCollection should listen for key update.