Update docs for new style
Add new doc pages to index
First pass at new signature.
Fix default group
Add security chapter to docs
Small docs consistency cleanup.
Updating tests
Keep updating tests.
Update Mixin for CBVs
Update docs for CBV and method decorator.
Flake8 cleanup
Start v0.5 changelog
Fix for Python 3
Update travis matrix
Skip confusing test for now.
Exclude one more build.
Run flake8 with tests.
Add upgrading docs and other small updates.
Finish the section I forgot earlier.
Add tests for zero/None rates.

Also clean up RequestFactory use in tests.