django.conf.urls.defaults was removed.

Import stuff from django.conf.urls instead. If we need to support django versions less than 1.4
then we need some compatibility stuff here.

Since 1.4 deprecated and moved to the new location.
https://docs.djangoproject.com/en/1.4/releases/1.4/#django-conf-urls-defaults

Removed in 1.6
https://docs.djangoproject.com/en/1.6/internals/deprecation/