get current folder issue.
Fixed  #274 Sys user's role cannot be empted
Revert Multiple_DropDownList.cshtml, it will post a empty value that will effect the post value.
Fixed the position data will be lost when the page designer throws exception.
Build 4.4.0.0630
Merge branch 'master' into new_milestone

Conflicts:
	Kooboo.CMS/CMSAssemblyInfoGlobal.cs
	Kooboo.CMS/Kooboo.CMS.Web/Areas/Sites/WebResources.config
	Kooboo.CMS/Publish/Default/Properties/AssemblyInfo.cs
Merge branch 'new_milestone' of https://github.com/Kooboo/CMS into new_milestone