optimized version and tests#3

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yarafan wants to merge 4 commits intospajic:masterfrom

Commits on Mar 6, 2019

optimized version and tests
yarafan
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Commits on Mar 12, 2019

add benchmark, rubyprof and samples
yarafan
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Commits on Mar 14, 2019

Date and json optimizations
yarafan
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Commits on Mar 17, 2019

use yajl as json encoder
yarafan
committed