For #267, added support for Zinnia working with the deprecation of django.contrib.comments. The contrib.comments app is moving to a 3rd party app called django_comments. The patch should be compatible with projects using the old django.contrib.comments and the new django_comments. Without this patch, a project using Zinnia will run into syncdb issues after porting to django_comments. See: http://django-contrib-comments.readthedocs.org/en/latest/porting.html