Merge pull request #9 from admpub/master

美化错误页面模板和增加对自定义错误页面模板的支持
Merge pull request #10 from admpub/master

增加钩子系统
improved format
Merge branch 'master' of github.com:lunny/xweb
bug fixed
Merge pull request #9 from lunny/master

更新到最新版