Release v1.6.0
Release v1.6.0

angushe/asynchbase,yuzhu712/asynchbase,SteamShon/asynchbase,hhshuai/asynchbase,tempbottle/asynchbase,tsuna/asynchbase,tsuna/asynchbase,hhshuai/asynchbase,tempbottle/asynchbase,OpenTSDB/asyncbigtable,manolama/asyncbigtable,pythian/asynchbase,nvoron23/asynchbase,OpenTSDB/asynchbase,manolama/asynchbase,OpenTSDB/asynchbase,manolama/asynchbase,SteamShon/asynchbase,angushe/asynchbase,Connexity/asynchbase,yuzhu712/asynchbase,Connexity/asynchbase,nvoron23/asynchbase