Add entry for 2.4.0 to downloads.xml
Add entry for 2.4.0 to downloads.xml

Apache9/hbase,ndimiduk/hbase,ndimiduk/hbase,ndimiduk/hbase,mahak/hbase,mahak/hbase,Apache9/hbase,ndimiduk/hbase,apurtell/hbase,apurtell/hbase,mahak/hbase,mahak/hbase,apurtell/hbase,Apache9/hbase,mahak/hbase,Apache9/hbase,mahak/hbase,apurtell/hbase,mahak/hbase,ndimiduk/hbase,apurtell/hbase,Apache9/hbase,Apache9/hbase,apurtell/hbase,Apache9/hbase,ndimiduk/hbase,mahak/hbase,ndimiduk/hbase,Apache9/hbase,apurtell/hbase,apurtell/hbase,mahak/hbase,apurtell/hbase,ndimiduk/hbase,mahak/hbase,apurtell/hbase,ndimiduk/hbase,Apache9/hbase,Apache9/hbase,ndimiduk/hbase