user center middleware

Usage:

var UserCenter = require("./usercenter")
app.use('/usercenter', UserCenter({app:app}));

or used as standalone server:

$ npm start

• [] Add role/createAt/modifyAt to user info
• [] API for app that uses this middleware
• [] Add admin entrance feature
  • at first view of login, if no admin role found then should be a view to initialize
• [] Add admin dashboard for user management
• [] Add admin dashboard for user trend(Chart.js) and logins
• [] OAuth api for other apps