title: Can not create South database models in Django 1.7
body: <p>Django 1.7 has built-in database migration mechanizm. However, I'd like to run South migrations for the ols third-party django apps.</p>
  
  <p>I failed to to 'syncdb' management command with Django 1.7 in order to create South models:</p>
  
  <pre><code>/south/management/commands/syncdb.py", line 82, in handle_noargs
  old_app_store, cache.app_store = cache.app_store, SortedDict([
  
  AttributeError: 'Apps' object has no attribute 'app_store'
  </code></pre>