replace user.provider with user.identity
It is now possible to change your screenname when you are unfortunate
enough to have the same name as someone else.
It is now possible to change your screenname
Merge remote-tracking branch 'origin/master'

Conflicts:
	rvr/core/admin.py
	rvr/core/api.py
	rvr/core/dtos.py
	rvr/views/main.py