socket.io prefer version from @thecubic

This patch removes my own patch to enable allowEIO3 in
favor of @thecubic's patch. They both do the same thing, but
@thecubic's is tested.

lib/server/websocket.js

@@ -72,7 +72,6 @@ function init (env, ctx, server) {
 
   function start () {
     io = require('socket.io')({
-      allowEIO3: true,
       'log level': 0
     }).listen(server, {
       //these only effect the socket.io.js file that is sent to the client, but better than nothing