HBASE-15341 1.3 release umbrella

vote: https://s.apache.org/hbase-1.3-rc0-vote

results: https://s.apache.org/hbase-1.3-rc0-vote-passes
Updated CHANGES.txt for HBase 1.3, commit 9086cece80e17376349c2184f95919c9c71ce4fd
1 file changed