Gutyán Gábor / circlestack

Details:
* get_models removed: https://docs.djangoproject.com/en/1.11/releases/1.7/#introspecting-applications
* post_syncdb removed: https://docs.djangoproject.com/en/1.11/releases/1.9/#features-removed-in-1-9
Alternative: post_migrate: https://docs.djangoproject.com/en/1.11/ref/signals/#post-migrate
* django.contrib.contenttypes.generic removed: https://docs.djangoproject.com/en/1.11/releases/1.9/#features-removed-in-1-9
GenericForeignKey and GenericRelation moved to django.contrib.contenttypes.fields module