title: Rxjs, fromEvent to handle multiple events
body: <p>What is the best way to handle multiple events on the same DOM node in rxjs 5.1?</p>
  
  <p><code>fromEvent($element, 'event_name')</code> but I can specify only one event at a time.</p>
  
  <p>I want handle <code>scroll wheel touchmove touchend</code> events.</p>