Bump version to 6.1.16
Bump version to 6.1.16-dev
Vendor in py.test; #558

Now that we support running the test with py.test, let's vendor it in as
well. Maybe in the future we'll use it for `make test` / `./gittip.py
test` and we can retire nosetest from vendor/.
Deleting redesign from main repo.
Make get_dollars_receiving() always return a Decmal
Update public.json to use new Participant model
Merge pull request #572 from rummik/public-json

Update public.json to use new Participants model, always return a Decimal from get_dollars_receiving()
Closes #507
Rewrite public.json tests
Remove redundant public.json tests from tests/test_pages.py
Additional tests for the `giving` key
Set Bob's claimed_time so Alice can actually tip him
Merge pull request #573 from rummik/gh507

Add giving key to public.json -- closes #507