MongoDB update 3.0 related issues resolving

MongoDB, MongoJS gotchas

1. authentication mechanism has to be manually set for mongodb 3.0+ version:

   db.connection = mongojs(process.env.MONGOLAB_URI || MONGODB, ["users"], {authMechanism: 'ScramSHA1'});
   

2. request JSON has to be manually convert to BSON format also: eg. object ID should be converted with mongojs.ObjectId('523209c4561c640000000001'). especially when updating with a dot notated criteria, update failssilently

The above two probably can be set at somewhere global but I assume MongoDB APIs will change