title: Check for 404 from Model Fetch in Backbone
body: <p>I have this code:</p>
  
  <pre><code>var quote = new kf.Models.Quote();
  quote.id = id;
  quote.fetch();
  </code></pre>
  
  <p>Now, what I'm trying to do is work out how to catch a 404 from the REST API, if the specified quote does not exist on the server,</p>
  
  <p>Any ideas?</p>