HAMA-888: Add more test cases for DenseDoubleVector

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1577886 13f79535-47bb-0310-9956-ffa450edef68
update notice file

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1578186 13f79535-47bb-0310-9956-ffa450edef68