HAMA-889: NonDefaultIterator of DenseDoubleVector never reaches the end

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1575712 13f79535-47bb-0310-9956-ffa450edef68
HAMA-568: Add faster synchronized collections for message queues

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1576554 13f79535-47bb-0310-9956-ffa450edef68
update team list

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1577034 13f79535-47bb-0310-9956-ffa450edef68
update DenseDoubleVector
Merge branch 'trunk' of https://github.com/apache/hama into trunk