title: Extending multiple classes in coffee-script
body: <p><a href="http://coffeescript.org" rel="noreferrer">The documentation</a> explain how to extend a class</p>
  
  <pre><code>class Zebra extends Animal
      ...
  </code></pre>
  
  <p>But how do I extend multiple classes? The following does <strong>not</strong> work</p>
  
  <pre><code>class Sidebar extends Controller, EventEmitter
      ...
  </code></pre>
  
  <p>But I wish it did. The JavaScript behind this is more than able to extend any number of classes using the <code>__extend</code> function, but is there a way to do it in coffee-script?</p>