FIX: TEMPLATE_DIRS setting must be a tuple
Update tests to unified_diff result change between python versions

result of  unified_diff changes between Python 2.5 and Python 2.7
Update manage.py in test app to recent django versions
Update urls.py syntax for recent django versions
Use json instead of simplejson

json is available from Python 2.6
Remove AdminMediaHandler from twill_runner

AdminMediaHandler deprecated in django 1.4
Do not run test_basic_testmaker unless Django 1.6
Rename test names to work with Django 1.6

See:
https://docs.djangoproject.com/en/1.6/releases/1.6/#new-test-runner
Add requirements
ignore tox and build files
Add tox configuration