Improve main description and example code.
Remove usage of assertRaisesRegexp due deprecation warning.
Add python3 compatibility classifiers to setup.py
Restore django's copy of unittest import.
Merge pull request #1 from niwibe/minor-improvements

Minor improvements and python3 compatibility notes.
Moving tests out of the django app
Remove versiontools dependency and change version number.
Improved exception management
Now always return safe string