ver 2.5.3	2015-03-24	calvin
		* Fixed a problem about not support CURLOPT_ACCEPT_ENCODING and CURLOPT_TRANSFER_ENCODING on low-version libcurl by use condition macro
		* Fixed a bug in function ResetSimSpiderEnv with multiplexing concurrency

ver 2.5.2	2015-03-23	calvin
		* Add function SetMaxRetryCount for setting max retry count
		* Add function GetDoneQueueUnitRetryCount for getting retry count at last
		* Add function SetAcceptEncoding for setting http accept-encoding
		* Add function SetTransferEncoding for setting http transfer-encoding
		* Add libcurl's DNS Cache
		* Swap HtmlLinkParser and pfuncResponseBodyProc
		* Improve the main process framework of events for performance

ver 2.5.1	2015-03-16	calvin
		* Solve a problem of compilation
		* Add function 'MoveUnsuccessfulDoneQueueUnitsToRequestQueue','ResetDoneQueue' used to move back to request queue from done queue

ver 2.5.0	2015-03-14	calvin
		* Adjusted function FuncTravelDoneQueueProc prototype
		* Add request queue and queue callback mechanism, the user can alternative the two queue using database or Redis and so on ( experimental )
		* Fixed a problem with url contains multibyte-characters

ver 2.4.0	2015-03-13	calvin
		* Add multiplexing concurrency automatic adjustment mechanism
		* Add HTTP request header custom special list
		* Append request header 'Referer' automatically
		* Improve the main process framework of events for performance
		* The curl object reuse mechanism for performance
		* Adjust the sample crawler 'simspider' code

ver 2.3.0	2015-03-08	calvin
		* Add the error code SIMSPIDER_ERROR_FUNCPROC_INTERRUPT, if callback function returns the code, crawling process interrupt immediately 
		* Modify the function AppendRequestQueue prototypes
		* Modify the function SimSpiderGo prototypes
		* Add function SetSimSpiderPublicDataPtrGetSimSpiderPublicDataPtr , Used to pass the crawler engine public data
		* Add function etDoneQueueUnitPrivateDataPtrGetDoneQueueUnitPrivateDataPtr , Used to pass private data when crawl each url
		* Add function EnableHtmlLinkerParser , used to set the crawler engine internal quick HTML links parser enabled, the default is enabled
		* Fixed a concurrent problem
		* Optimized the crawler example program 'simspider'

ver 2.2.1	2015-02-09	calvin
		* Fixed the automatic completion bug from entrance to website
		* Fixed a safe pointer bug
		* Fixed a bug on WINDOWS platform

ver 2.2.0	2015-02-07	calvin
		* Modify the function SimSpiderGo prototypes. Well, I don't change since
		* Modify the function name AppendRequestUnit to AppendRequestQueue. Well, I don't change since too
		* add function ResizeRequestQueue used to adjust the request queue size, in order to adapt to crawl 
		* Simplify the util module, remove the third-party libraries iconv dependencies
		* Rearrange the error code

ver 2.1.1	2015-02-05	calvin
		* Stripping of third-party libraries fasterxml,fasterjson dependencies 
		
ver 2.0.1	2015-02-04	calvin
		* Fixed a bug
		* WINDOWS Supported

ver 2.0.0	2015-02-01	calvin
		* support concurrents in single process

ver 1.0.0	2014-12-12	calvin
		* create