Add memfree document for sysguard.
Add sysguard document.
Merge pull request #43 from yzprofile/master

fix menu
Update core_cn.html
Update core.html
Merge pull request #44 from cfsego/master

update document of core.html
fixed the page header for session sticky module
translate all the MS-DOS format docs to UNIX format

All the changes are replacing '\r\n' to be '\n'.
Document of http sysguard module
Merge pull request #41 from lifeibo/topic

Add sysguard documents.
Merge remote-tracking branch 'origin/master' into update_20130326

Conflicts:
	document/http_sysguard.html
	document_cn/http_sysguard_cn.html
Merge pull request #45 from yaoweibin/update_20130326

Update 20130326
fixed the wrong path in the session_sticky module
changed the Chinese docs' index page to index_cn.html
fixed the wrong documentation url of TFS module
Merge pull request #46 from yaoweibin/update_201303262

Update 201303262
released tengine-1.4.5
updated the nginx version to 1.2.8 in index_cn.html
Merge pull request #47 from yaoweibin/tengine-1.4.5

Tengine 1.4.5
added the docs for consistent hash module