title: Django 1.5 graph extensions -x option ignored
body: <p>I use <code>django-extensions</code> to visualize my database structure of my Django project (Django Version 1.5) with the command <code>python manage.py graph_models my_model -x user -o output.png</code>.</p>
  
  <p>Unfortunately, after upgrading to Django 1.5, graph_models ignores the option <code>-x</code>. This option can be used to exclude models from the graph.</p>
  
  <p>Since I have the <code>user</code> model in almost all models in my Django app, it is important for me to exclude the user from the graph. Otherwise the graph becomes too full and hard to read.</p>
  
  <p>I would be thankful for any suggestions on how to work around that.</p>