introduce zk-stats: zk-latency + zk-rate - #320

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Commits on Mar 29, 2017

introduce zk-stats: zk-latency + zk-rate
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Commits on Mar 30, 2017

fix: added read-latency histogram, reduce histogram-highestTrackableTime, measuring time using nano-sec, 3 write-count for create-ledger
rdhabalia
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