Removed deprecated 'defaults' from django.conf.urls

See: https://docs.djangoproject.com/en/dev/releases/1.4/#django-conf-urls-defaults

The old behavior will be removed in 1.6. Hence it'd be great if you could merge this and put out a new release. If you have any further questions, comments and/or recommendations - don't hesitate.

And thanks. Thanks so much for developing such a wonderfully simple but great product. :+1: