title: stop method on hub doesn't fire onDisconnect
body: <p>When a user logout from my web application, I explicitly end its hub's connection with the following code</p>
  
  <pre><code>$.connection.hub.stop();
  </code></pre>
  
  <p>On the server side, I would expect that my implementation of the Hub class would instantly reach my override of OnDisconnected() method wich is not the case. The method ends up by being called but only when the disconnection timeout is reached. What should I do to be notified instantly server side that the stop method was call on my client's hub ?</p>