fixed a few problems of DataMan / ZeroMQ, added simple Read API to ge…#291

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JasonRuonanWang wants to merge 1 commit intoornladios:masterfrom JasonRuonanWang:dataman

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Commits on Oct 27, 2017

fixed a few problems of DataMan / ZeroMQ, added simple Read API to get the helloworld example working again
JasonRuonanWang
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