* Set up tox for testing supported Django/Python combinations
* Also include tox env for checking and building docs
* Use tox-travis for Travis CI integration
* Add tests against Django master
* Document building docs and running tests with tox
* Follow current setup.py recommendations from the pypa sample project
(utf-8 encoding on file reads, ensure files are read relative to
own location)
* Add/update some missing classifiers and other metadata
* Read _version.py constants into an isolated dict (rather than
the global setup.py context)
* Add setup.cfg specifying universal bdist_wheel
Cherry-picked from:
8c26807a - Add runtests.py for testing separately from other Django apps
cd8504b1 - Make tests compatible with setuptools
4ac65b78 - Set up testing on the backend API calls, using mock
