Changes to be committed:
	modified:   app/controllers/IndexController.php
	deleted:    app/controllers/SessionController.php
	modified:   app/controllers/UserController.php
	new file:   app/views/layouts/entry.volt
	deleted:    app/views/session/index.volt
	new file:   app/views/user/index.volt
	new file:   app/views/user/login.volt
	new file:   public/div-test.html
	new file:   public/img/splash01.png
	new file:   public/img/splash02.png
	new file:   public/img/splash03.png

修改整体结构，适配移动端，更像客户端应用。
 Changes to be committed:
	modified:   app/controllers/UserController.php
	modified:   app/forms/RegisterForm.php
	modified:   app/library/Elements.php
	modified:   app/views/user/register.volt
	modified:   public/js/utils.js

完成新界面：首页、注册、登录页面