title: Including the get_absolute_url value in JSON output
body: <p>Just getting into Django Rest Framework.</p>
  
  <p>I have a simple example running where a model is being presented through the REST API. There are no Related fields in the model, just a bunch of strings.</p>
  
  <p>What is the easiest way to present the <code>get_absolute_url()</code> value of that model into the JSON output?</p>
  
  <p>I'm using <code>serializers.HyperlinkedModelSerializer</code> in preparation for moving into more complicated models that do have related fields.</p>