New methods for Mangos

mangos-models.js

// eg.
var 
Mangos = require("mangos"),
connection = new Mangos("supercooldb", "127.0.0.1", 27101),
model = {
  //when adding or updating or returning
  defaults : {  // default values for model
    first_name : "Bob",
    last_name : "Hope",
    notifications : true
  },
  //when adding or updating
  allowOnly : [ // limit what keys can be saved _id will always be allowed
    "first_name",
    "last_name",
    "password",
    "notifications",
    "username",
    "token",
    "salt"
  ],
  //when adding or updating
  autoUpdate : true, // updates keys in db if out of sync with model
  //when returning
  privateKeys : [ // keys that will never be returned
    "password", 
    "salt"
  ]
},
users = connection.Collection( "users" , model )

users.read( ... )
users.create( ... )