Properly honor timestamps in DeleteRequest.
Properly honor timestamps in DeleteRequest.

This fixes #58.

Signed-off-by: Benoit Sigoure <d0ba46810740e35622837d76cd77ceb8c4bf46f5@gmail.com>

pythian/asynchbase,mway08/asynchbase,adityakishore/asynchbase,OpenTSDB/asynchbase,OpenTSDB/asynchbase,angushe/asynchbase,hzy001/asynchbase,mapr/asynchbase,OpenTSDB/asyncbigtable,Connexity/asynchbase,hhshuai/asynchbase,StumbleUponArchive/asynchbase,tsuna/asynchbase,nvoron23/asynchbase,manolama/asyncbigtable,adityakishore/asynchbase,yuzhu712/asynchbase,tempbottle/asynchbase,SteamShon/asynchbase,mapr/asynchbase,StumbleUponArchive/asynchbase,tempbottle/asynchbase,nvoron23/asynchbase,manolama/asynchbase,manolama/asynchbase,angushe/asynchbase,mway08/asynchbase,SteamShon/asynchbase,tsuna/asynchbase,hhshuai/asynchbase,hzy001/asynchbase,Connexity/asynchbase,yuzhu712/asynchbase