删除全部事件后删除原生事件
事件支持once绑定
事件删除的bug修复
删除本地example
Merge remote-tracking branch 'jm/dev' into dev
Merge branch 'dev' of github.com:HanCong03/kitygraph into dev
修复删除事件时的bug
Merge branch 'dev' of github.com:HanCong03/kitygraph into dev
Class System Update