Loopback Nodejs schema: how to add Firebase and Parse as models?

I want to add parse.com and firebase.com to Strongloop Loopback project. I want them to be REST models. How to do it?

edit: I have included the Loopback REST model connector. I ran into creating a REST CRUD schema for this: http://docs.strongloop.com/display/LB/REST+connector

I would really love it if someone who has done this before, for Parse and / or Firebase, share their CRUD REST schema schema here.