HBASE-9115 HTableInterface.append operation may overwrites values (Ted Yu)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1509921 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9087 Handlers being blocked during reads (Elliott)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1509922 13f79535-47bb-0310-9956-ffa450edef68
HBASE-8949 hbase.mapreduce.hfileoutputformat.blocksize should configure with blocksize of a table (rajeshbabu)

git-svn-id: https://svn.apache.org/repos/asf/hbase/branches/0.94@1509923 13f79535-47bb-0310-9956-ffa450edef68
Merge remote branch 'origin/0.94' into 0.94-gd
Merge remote branch 'origin/0.94-gd' into fb-YAHOO-317-0.94-gd