Don't update the project amount needed after donation.

BB-895 #resolve
Merge pull request #518 from benkonrath/donation-tweaks

Don't update the project amount needed after donation.
Donation copy update.

BB-901 #resolve
Donation copy update 2.

BB-902 #resolve
Donation copy update 3.

BB-903 #resolve
Merge pull request #520 from benkonrath/donation-tweaks

Donation tweaks
Fix broken frontend test in donation.
Merge pull request #521 from benkonrath/donation-tweaks-2

Fix broken frontend test in donation.
Change from expertise to skills through fks
Add skill to task (ember and db)
Add classname to slides
Change to dkimpy
Fix tag skills + tests
Small fix for projectlist test
Mailings for tasks and fixes for wp mails
Have unique project titles across multiple tests