support captcha
添加插件机制，和2个插件
readme中添加插件介绍
求来访插件加说明
fix bug
pep8 style fix
Merge branch 'master' of git://github.com/wong2/xiaohuangji into root-repo
use pid to distinguish icodes; remove icode file after login
copyright info. (following format of controller.py)
Merge pull request #11 from hupili/master

Saving Captcha Locally and Input From Console
删掉几句注释掉的代码
合并插件机制到主干
让simsimi可测
修复在评论里被@时回复错误的问题
地震