title: Install(rollback) to older socket.IO version
body: <p>I am currently running version 0.9.16 of socket.IO and need to rollback to version 0.9.0</p>
  
  <p>Can I simply install on top of my newer version using <code>npm install socket.io@0.9.0</code> ?</p>
  
  <p>Or do I need to uninstall the newer version first?</p>