add express app
added mongoose logic for user with encrypted password.
lots of this was taken from obiechat and here:
http://blog.mongodb.org/post/32866457221/password-authentication-with-mongoose-part-1
update with new server
played around a little bit in alloy. added in a nifty module for syncing our models with the server (restapi). that's what allows us to call fetch on the collection and it automagically know to call GET localhost:3000/users for our users collection.
Merge pull request #1 from jackrr/mongo-and-express

Mongo and express, early beginnings of user stuff