Update project amount after donation

- Remove user & status fields from Donation
- Update donation admin & serializer to use Order user & status
- Fire signal on Order transition
- Update Project amounts on order status change signal
- Fire signal on Order request
- Check Payment status for locked orders if they are requested
I think this needs to be: 'Meta': {'object_name': settings.FUNDRAISERS_FUNDRAISER_MODEL.split('.')[-1]}