add keys

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1520180 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare release 0.6.3-RC1

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1520943 13f79535-47bb-0310-9956-ffa450edef68
[maven-release-plugin] prepare for next development iteration

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1520945 13f79535-47bb-0310-9956-ffa450edef68
HAMA-801 - applied Anastasis's patch

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1520973 13f79535-47bb-0310-9956-ffa450edef68
HAMA-801 - updated changelog

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1520997 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of https://github.com/apache/hama into trunk