Fix connection error in Django 1.6.5; explicit enable auto commit

1. Fixed: Error: connect() takes at least 4 arguments (0 given) (Django==1.6.5, pynuodb==2.1, nuodb-django==2.0.5)
2. It seems that auto commit must be explicit declared (ATOMIC_REQUEST=True) otherwise data is not commited on database at the end of request (admin).