added heroku support for dynamic port reading via process.env

app.js

@@ -18,7 +18,7 @@
 
 // Configuration setup
 nconf = require('nconf');
-nconf.argv();
+nconf.argv().env();
 
 var fs = require('fs'),
 	winston = require('winston'),

src/webserver.js

@@ -462,5 +462,5 @@ var express = require('express'),
 
 }(WebServer));
 
-server.listen(nconf.get('port'));
+server.listen(nconf.get('PORT') || nconf.get('port'));
 global.server = server;