title: Socket IO Rooms: Get list of clients in specific room
body: <p>I'm trying to display a list of clients in a specific room. I just want to show their username, and not their socket id.</p>
  
  <p>This where I'm at:</p>
  
  <pre><code>socket.set('nickname', "Earl");  
  socket.join('chatroom1');
  console.log('User joined chat room 1);
  
  var roster = io.sockets.clients('chatroom1');
  for ( i in roster )
  {
     console.log('Username: ' + roster[i]);   
  }
  </code></pre>
  
  <p>Haven't had any luck getting it to list Socket IDs or anything. Would like it to return the nicknames however.</p>