* visiting project will create notification setting if missing
* change notification setting per project even without membership
* use notification settings instead of membership on profile page
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>
It will hold notification setting per group or per project. It will
allow get rid of notification level stored in Member model
Signed-off-by: Dmitriy Zaporozhets <dmitriy.zaporozhets@gmail.com>