title: Django create template filter for nice time
body: <p>I know there's <code>timesince</code> filter.</p>
  
  <p>But I want something that returns this:</p>
  
  <ul>
  <li>just few seconds ago</li>
  <li>X minutes ago</li>
  <li>X hours ago</li>
  <li>on $day_name</li>
  <li>X weeks ago</li>
  <li>X months ago</li>
  </ul>
  
  <p>Examples:</p>
  
  <ul>
  <li>just few seconds ago</li>
  <li>37 minutes ago</li>
  <li>2 hours ago</li>
  <li>yesterday</li>
  <li>on Thursday</li>
  <li>1 week ago</li>
  <li>7 months ago</li>
  </ul>
  
  <p>How can I implement something like this?</p>