Prepare for 1.0 Release

* Fixed ReST formatting so that code blocks show up
* Fix runtests.py to work with the new app-loading refactor on Django 1.7+
* Set up Travis CI (already was mostly set up, but not activated)
* Minor wording changes to docs
* A few flake8 changes
* tox: Add Python3.3 as a target for recent versions of Django