title: Angular2 - How to close WebSocketSubject underlying socket
body: <p>Is there a way to obtain the socket being subscribed by WebSocketSubject?</p>
  
  <p>When a certain condition happens I need to close the underlying socket.</p>
  
  <p>I tried to close it by complete() but it didn't close the socket. The unsubscribed doesn't work either.</p>
  
  <p>Could anybody help me? Or point me in the right direction?</p>