Delete donations when recurring order is deleted.
Merge pull request #763 from benkonrath/monthly-donations-process-bug-fixes

Delete donations when recurring order is deleted.
Merge pull request #764 from benkonrath/general-bug-fixes

Change imports for tests to import from bluebottle.
Show admin dontation payment method like it's shown in Salesforce.
Set paid as default donation status in admin.
Add payment icons to admin.
Cancel payments for closed orders on log in.

Plus some other cleanups.

BB-1501 #resolve