Fix broken doctests
Merge pull request #1175 from frewsxcv/patch-2

Fix broken sphinx docs, thanks @frewsxcv
Updated deprecated manage.py code, added authorization tests to tox.
Enabled customuser tests in tox, fixed customuser tests, changed run_all_tests.sh to work with all versions of Django.
Merge pull request #1140 from SeanHayes/test-enhancements

Test enhancements to make your life easier.
We now pass around related_bundle and use it instead of dehydrating all over again.
Added related_bundle to contentypes related fields. Also moved the order of related_bundle in method signatures to maintain backwards compatibility in when called with positional args.