HAMA-819: Make number of RPC Server threads configurable

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1559986 13f79535-47bb-0310-9956-ffa450edef68
Object reuse.

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1559998 13f79535-47bb-0310-9956-ffa450edef68
Minor refactor.

git-svn-id: https://svn.apache.org/repos/asf/hama/trunk@1560236 13f79535-47bb-0310-9956-ffa450edef68
HAMA-857: Graph Combiners is wrongly implemented (edwardyoon)

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Revert r1556691

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Remove skipiterator feature

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Fix unit test of PageRank.

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HAMA-838: Refactor aggregator.

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HAMA-860

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Update my info

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HAMA-859: Leverage commons cli2 to parse the input argument for NeuralNetwork Example

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Merge updates from trunk