HAMA-795: Implement Autoencoder based on NeuralNetwork

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1518055 13f79535-47bb-0310-9956-ffa450edef68
HAMA-798: Fix TestIPC unit tests

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1518059 13f79535-47bb-0310-9956-ffa450edef68
HAMA-795: test bug fix

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1518436 13f79535-47bb-0310-9956-ffa450edef68
Merge branch 'trunk' of git://git.apache.org/hama into trunk