fix python-3 compatibility

- fix bug in django version handling
- fix dict().keys()[0]
- fix regex for ImportError
- fix checking string types as 'basestring'
- new autofixtures version (previous doesn't support Py3K)
А вообще. requirements.txt кто-нибудь использует? travis ставит из setup.py зависимости
``` 
pip install -e . --use-mirrors
```