Black&white-list addon.

1.Using https://github.com/astaxie/beego/tree/master/config to read configurations from file(JSON format).
2.Using https://github.com/howeyc/fsnotify to watch configuration files has changed.If watcher notifies MODIFY event, reload configurations.
3.Using Redis & https://github.com/fzzy/radix to be a counter which will record the invalid requests & add the source ip into blacklist.