title: How to group permissions for some models?
body: <p>I have today 2 models:</p>
  <ul>
  <li>Image</li>
  <li>Video</li>
  </ul>
  <p>These models have their own permissions (&quot;Can add Image&quot;, &quot;Can add Video&quot;, etc ...)
  I would like to make a permission that combines both.</p>
  <p>For example:
  I want to create the permission &quot;Can add Media&quot;. And If I add the permission &quot;Can add Media&quot; to an user, he can add Image or Video.</p>