* try to update dns system from golang source code
* make dns easy
* update version number
* fix dns config not found error
* update blackip list in resolv.conf
* use lookuper
- remove static hostfile
* use map as blackip struct
- remove useless code
* change free strategy
* add session pool
WARN: this commit just for test
* fix no index issue
* new session pool system.
WARNING: that's no lock in management system. So use management page when another goroutine modify sessions/ports will get mistake.
* fix index out of range bug
* 远端系统增加管理接口
* change length of last ping time
* add admin interface
* update readme
+ counter system of session, hope it works.
* fix read/write count swapped issue
* adjust shrink time