Upgrade to stanford-corenlp-3.8.0#15

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AgoloKennethTan wants to merge 9 commits intopilehvar:masterfrom

Commits on Aug 9, 2017

Updated to use stanford-corenlp-3.7.0
Kenneth
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reverted wn30g.word.ppv.path change
Kenneth
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Commits on Aug 10, 2017

Allow compiling with dependencies
AgoloKennethTan
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Commits on Aug 15, 2017

Commits on Apr 18, 2018

Deleted unnecessary file.
AgoloKennethTan
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Commits on May 3, 2018