title: RxJS - Create Observable from an EventEmitter's multiple events
body: <p>I have a node.js EventEmitter which raises the following events: <code>error</code>, <code>message</code>.</p>
  
  <p>Is there a straight forward way I can create an RxJS Observable from it?</p>
  
  <p>i.e <code>next()</code> called on <code>message</code> and <code>error()</code> called on <code>error</code>. </p>