title: ImportError: cannot import name timezone
body: <p>After installing django-norel, and running <code>python manage.py shell</code>, I get this error:</p>
  
  <pre><code>&gt;&gt;&gt; from django.utils import timezone
  Traceback (most recent call last):
    File "&lt;console&gt;", line 1, in &lt;module&gt;
  ImportError: cannot import name timezone
  </code></pre>
  
  <p>using Ubuntu 12.04 LTS, python 2.7.3, django 1.4, and last versions of 
  django-nonrel, djangotoolbox and django-mongodb engine</p>
  
  <p>It seems to be some kind of incompatibility problem. Should I use an earlier version of django? If so, how can I specify the django version on the install command?</p>