Replace the Netflux old client (netflux.js) by the Netflux2 client.

Move the WebRTC peer-to-peer use case in /padrtc, which still uses the old
Netflux client
Use es6-promises.min.js to solve a issue with some browser and the new
Netflux client

WebRTCSrv.js

@@ -10,6 +10,7 @@ var run = module.exports.run = function(server) {
     socket.on('message', (data) => {
       try {
         let msg = JSON.parse(data)
+        console.log(msg)
         if (msg.hasOwnProperty('key')) {
           for (let master of server.clients) {
             if (master.key === msg.key) {