Tests :)

Works with django 1.3, 1.4, 1.5, python 2.6, 2.7, 3.2, 3.3.
100% branch coverage
Uses py.test to run tests
Tox configuration included

Tox output:
```
  py2.6-d1.3: commands succeeded
  py2.7-d1.3: commands succeeded
  py2.6-d1.4: commands succeeded
  py2.7-d1.4: commands succeeded
  py2.7-d1.5: commands succeeded
  py3.2-d1.5: commands succeeded
  py3.3-d1.5: commands succeeded
  congratulations :)
```