Add host address configuration

server.js

@@ -1,7 +1,4 @@
 const app = require('./app');
 const config = require('config');
-const util = require('util');
 
-module.exports = app.listen(process.env.PORT || config.port || 3000, function() {
+module.exports = app.listen(process.env.PORT || config.port, process.env.HOST || config.host);
-	util.log('Server started: http://localhost:%s/', this.address().port);
-});