Very sketchy draft for Sequelize formatter

This is a rather sketchy implementation for Sequelize.

It just does what it needs to do for me. Definitely not ready, so feel free to not-merge, just wanted to bring it to your attention, maybe you or someone else feels like picking it up.

Somebody here asked for it here, so I figured I could at least share what I have:
http://stackoverflow.com/questions/10060265/sequelize-how-to-import-definitions-from-an-existing-database