Rename VisitRule to ABTest
Fixed lazy load content tree collapse issue.
Fixed issue: http://forum.kooboo.com/yaf_postst2160_DataRule-sorting-doesn-t-work--XML-DB--Kooboo-4-0-2--29-03-2013.aspx
Fixed issue: http://forum.kooboo.com/yaf_postst2155_Error-when-using-Azure-table-storage-provider.aspx