title: Heroku/Django: No module named dj_database_url
body: <p>I'm trying to set up PostgresSQL for the first time on Django, running into this error when I try to do a syndb?</p>
  
  <blockquote>
    <p>ImportError: Could not import settings 'testapp.settings' (Is it on sys.path?):</p>
  </blockquote>
  
  <p>Also have this at the toop of my settings.py file, no idea if this is correct?</p>
  
  <pre><code>import dj_database_url
  DATABASES = {'default': dj_database_url.config(default=os.environ.get('DATABASE_URL'))}
  </code></pre>