HAMA-594: Semi-Clustering Algorithm Implementation

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1511158 13f79535-47bb-0310-9956-ffa450edef68
HAMA-791: Fix the problem that MultilayerPerceptron fails to learn a good hypothesis sometimes

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1511164 13f79535-47bb-0310-9956-ffa450edef68
HAMA-790: small fix

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1511165 13f79535-47bb-0310-9956-ffa450edef68
HAMA-792: add test datasets for ML package

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1512950 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of git://git.apache.org/hama into trunk