change to MONGODB_URI

Author: chrisckchang

app.js

@@ -40,8 +40,7 @@ var mongoose = require ("mongoose"); // The reason for this demo.
 // Here we find an appropriate database to connect to, defaulting to
 // localhost if we don't find one.  
 var uristring = 
-  process.env.MONGOLAB_URI || 
-  process.env.MONGOHQ_URL || 
+  process.env.MONGODB_URI || 
   'mongodb://localhost/HelloMongoose';
 
 // The http server will listen to an appropriate port, or default to