add few models, keep everything apart for now, maybe separate routes

server.js

@@ -2,6 +2,8 @@ var express = require('express'),
 app = express(),
 port = process.env.PORT || 3000,
 mongoose = require('mongoose'),
+Group = require('./api/models/groupModel'),
+Permission = require('./api/models/permissionModel'),
 User = require('./api/models/userModel'), //created model loading here
 bodyParser = require('body-parser');