title: ng2 stomp client - how to re-subscribe after re-connecting?
body: <p>I am subscribing to a socket using ng2-stomp-service:</p>
  
  <pre><code>this.fooSubscription = this.stomp.subscribe('/topic/foo', (res) =&gt; {
      console.log('do stuff with res');
  });
  </code></pre>
  
  <p>Sometimes the connection is lost, and I see "Whoops!  Connection is lost. Reconnecting..."</p>
  
  <p>At that point, Stomp automatically re-connects, but it never re-<em>subscribes</em> so I can start receiving data again.</p>
  
  <p>How do I re-subscribe after Stomp automatically re-establishes the connection, so I can start receiving data again?</p>