Fix compatibility with Netty 3.5.1.
Fix compatibility with Netty 3.5.1.

Because we're doing some evil reflection stuff to work around some
arbitrary decision in Netty that makes stuff harder to debug.  This
closes #29.

Change-Id: I3106fbdfa57ab9a58da5da10807b7eff1113b8df

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