failing test
fix update_giving
update participant's giving after team take is changed.
Fix fake_payday to add loop
fix comments
Revert "failing test"

This reverts commit a4ff0b37f73243c77934c60cd242424a391dcbb1.
fix test
test multiple iterations of the tips loop
Merge pull request #2988 from gratipay/fix-fake-payday-depth

Fix fake payday depth