title: django-river: example of change in state from a view
body: <p>I am trying to use <code>django-river</code> to track and control the flow of objects in my application.</p>
  <p>In particular, I have objects representing document that will pass from the author to a reviewer and then on to a production team, ideally based on a view controlled by a button press. I was intending to have an <code>owner</code> field that could be changed to indicate who currently 'has' the document.</p>
  <p>Can someone please give me a short example of how this might work?</p>
  <p>Thank you!</p>