convert doctests to unittests and only run uuid tests if uuid is not shipped with python (version < 2.5)
add six to install_requires, refs #288
add conditional imports for force_unicode and use six for python 3 support, refs #288
use as in except, refs #288
conditional StringIO import, refs #288
update django version for tox, refs #288
add tests for Django 1.5 and Python 2.6, 2.7 and 3.3, refs #288
Fixed some pep8 errors
Added Python 3 and Django 1.5c2 to travis.yml

refs #288
Used unittest imports from Django, refs #288
Merge pull request #308 from fhahn/master

Python 3 and Django 1.5 support