resolve animation issue

problem was that the model for the view wasn’t the same as the model
that was created to instantiate a view.  When a model from the
collection is removed, Marionette looks up the matching view from the
BabySitter object by it’s model’s cid, but we swapped the model to be
the one we need for the view.  This approach is bad - need to switch to
having the views creating the secondary views, and having the base view
simply manage the animation and swapping for individual views.
simplify how views are shown
commit glitch
cleanup