title: Reverse sort order with Backbone.js
body: <p>With <a href="http://documentcloud.github.com/backbone/" rel="nofollow noreferrer">Backbone.js</a> I've got a collection set up with a comparator function. It's nicely sorting the models, but I'd like to reverse the order. </p>
  
  <p>How can I sort the models in descending order rather than ascending?</p>