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
Improve donations
More changes to migrations
Fixed donation tests
Merge pull request #931 from onepercentclub/feature/book-757-update-project-after-donation

Update project amount after donation