Added web sockets

Changed index.js to add WebSockets to the server
Changed index.html to add WebSockets to the client
Install ws (web sockets) module

node_modules/ws/browser.js

@@ -0,0 +1,8 @@
+'use strict';
+
+module.exports = function () {
+  throw new Error(
+    'ws does not work in the browser. Browser clients must use the native ' +
+      'WebSocket object'
+  );
+};