title: South - Not detecting changes to Django model
body: <p>I have Django model that I already have initialized with south using <code>./manage.py schemamigration (appname) --initial</code>. All was going well through this point, until I decided I needed another field. I added another field and tried to to migrate the change with <code>./manage.py schemamigration (appname) --auto</code>, but it says:</p>
  
  <pre><code>- Nothing to migrate.
  </code></pre>
  
  <p>I made sure to migrate the initial changes.
  Seems to be similar to the problem <a href="https://stackoverflow.com/questions/8635492/django-south-not-detecting-db-changes">here</a>, but the solution got me nowhere.</p>