Django 1.7 compatibility + Add admin model (with docs and tests)

No longer use deprecated methods for Django 1.7. Fix quicktest.py for Django 1.7.

Admin model taken from #18 . Documentation and tests have been added.

Added Django 1.7 and Python 3.4 for travis.
I see there are 80+ columns lines in the other files, I'll just put it on a single line.