New label management and data storage. #206 #217

Some more fields in label: UtcCreationDate UtcLastestModificationDate LastestEditor UUID
Merge branch 'master' of https://github.com/Kooboo/CMS

Conflicts:
	Kooboo.CMS/CMSAssemblyInfoGlobal.cs
	Kooboo.CMS/Publish/Default/Properties/AssemblyInfo.cs
	Kooboo.CMS/version.txt
Label categories issue.
ViewContext.HttpContext.Member() ->  ViewContext.HttpContext.Membership()
Content validation issues. #243
Merge branch '4.3'

Conflicts:
	Kooboo.CMS/CMSAssemblyInfoGlobal.cs
	Kooboo.CMS/Publish/Default/Properties/AssemblyInfo.cs
	Kooboo.CMS/version.txt