Add note on how to build 0.94 against hadoop 2.2

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1545159 13f79535-47bb-0310-9956-ffa450edef68
HBASE-9976 Don't create duplicated TableName objects

git-svn-id: https://svn.apache.org/repos/asf/hbase/trunk@1545177 13f79535-47bb-0310-9956-ffa450edef68