User is prompted to select peer after registration.
We have to show him a multiselect input, remove peer foreign key
from account and make some changes that havent been done.

A user can belong to more than one peers

Apply change of ForeginKey peer to M2M relationship peers on UserProfile model to whole project. Make use of model PeerNotify to notify peers on users actions.

Fix PeerNotify presentation issues at django admin site. Data migration to add notifications already made for prior user activations.

Add PeerNotify model. It is useful for keeping track of notifications have been sent to peers due to actions of their users.