ver 1.2.3	2014-06-10	calvin
		* now disconnect has not mandatory on online change forwarding rules , the command "clean forwards" is used to force disconnect the old sessions
		* optimizes the load balancing algorithm LC,RT
		* add comments in English
		
ver 1.2.2	2014-05-24	calvin
		* add english document

ver 1.2.1	2014-05-11	calvin
		* add command arguments for runing as windows service
		* fixed a bug : data hungry on sending slow than receiving on duplex communication transfer
		* fixed a bug : discard some properties on export rules

ver 1.2.0	2014-04-19	calvin
		* Add #include <limits.h>
		* Support WINDOWS,like UNIX ( select model )
		
ver 1.1.0	2014-04-12	calvin
		* optimize forward session unit
		* Add code for recv more than send on nonblock-mode
		* Add rule property "timeout"
		* Add client property "maxclients"

ver 1.0.0	2014-03-29	calvin
		* Create
		* Support Linux ( epoll model )