title: Socket.on() listen for any event
body: <p>I want to catch when any event, regardless of the name was sent from a socket. Is there some sort of wildcard I can use here for that?</p>
  
  <pre><code>io.on('connection', function (socket) {
      socket.on('any event', function (data) {
          ...
      });
  });
  </code></pre>