Add a session variable.
Improve the static Json class API.
Add a captcha module ~
Improve the function of Model.
Update example. Modified the origin example files.
Add models of Comments, Focus, User, Weibo. And add login and register controllers.
Modified the return information of login controller.
add a rbac module.
fixed a bug in example controller.
Merge with develop-example.
Fix the bug of rbac.