title: sending notifications when accessing api page
body: <p>When a user add a comment to an image,<br>
  some users including the author of the image gets notified via Push notification.  </p>
  
  <p>I had it working in a regular view.<br>
  Now I'm adopting tastypie framework, and converting this view.  </p>
  
  <pre><code>class CommentResource(ModelResource):
  
  ..
     def obj_create(....):
          #send notifications
          #actually create the comment object
  </code></pre>
  
  <p>It just feels weird having <code>sending notifications</code> in API, so I'm asking 
  if this is a fine practice.  </p>