title: How can i get all models in django 1.8
body: <p>I am using this code in my <code>admin.py</code></p>
  
  <pre><code>from django.db.models import get_models, get_app
  
  for model in get_models(get_app('myapp')):
      admin.site.register(model)
  </code></pre>
  
  <p>But i get warning that <code>get_models is deprecated</code></p>
  
  <p>How can i do that in django 1.8</p>