[Mod] Modify the website structure to MVC structure

The way to clone this patch is...

1. git pull, or remove the origin one and clone a new one
2. git checkout new
3. remember to use "npm install" to install the nodejs module
4. use "node app.js" and open browser "127.0.0.1:5000" to view
   if you've installed heroku toolkit, use "foreman start" is better