Merge pull request #16 from heroku/env-port

Use ENV port but fallback to 4040

Author: drew-gross

Parse-Dashboard/index.js

@@ -21,4 +21,4 @@ app.get('/*', function(req, res) {
 });
 
 // Start the server, listening to port 4040.
-app.listen(4040);
+app.listen(process.env.PORT || 4040);