Added dinamic server port for node server

Author: Ferie

server.js

@@ -23,6 +23,6 @@ localhost.get(/.*/, function (req, res) {
     res.sendFile(__dirname + mainFile);
 });
 
-localhost.listen(localhostPort, function () {
-    console.log("Start surfing at localhost:%d", localhostPort);
+localhost.listen(process.env.PORT || localhostPort, function () {
+    console.log("Start surfing at localhost:%d", (process.env.PORT || localhostPort));
 });