Add new logo


git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1559681 13f79535-47bb-0310-9956-ffa450edef68
stylesheet change

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1559863 13f79535-47bb-0310-9956-ffa450edef68
HAMA-853: Refactor Outgoing message manager (edwardyoon)

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1559885 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of git://git.apache.org/hama into trunk