Add TensorFlow library to Pyret#287

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ZacharyEspiritu wants to merge 4 commits intobrownplt:horizonfrom

ZacharyEspiritu:tensorflow-lib

Commits on Jul 4, 2018

Import @tensorflow/tfjs npm package
ZacharyEspiritu
committed

Commits on Jul 12, 2018

Merge branch 'horizon' into tensorflow-lib
ZacharyEspiritu
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Commits on Aug 17, 2018