Made cloud9IDE port conditional, default to 9000

Author: Proful

src/main.js

@@ -1,6 +1,7 @@
 var http = require('http');
+process.env.C9_PORT = process.env.C9_PORT || 9000
 http.createServer(function (req, res) {
   res.writeHead(200, {'Content-Type': 'text/plain'});
   res.end('Chat.js Server ready for interaction\n');
 }).listen(process.env.C9_PORT, "0.0.0.0");
-console.log('Server running at http://127.0.0.1:9000/');
+console.log('Server running at http://127.0.0.1:9000/');