switch from NPM to YARN#2

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emjaynotmj wants to merge 3 commits intomasterfrom

Commits on Aug 3, 2017

switch from NPM to YARN
Emjay
committed

Commits on Aug 12, 2017

added code block to remove yarn.lock before running 'yarn install' to allow for pickup of new packages
Siddhartha Goyal
committed

Commits on Aug 18, 2017

added new ignore files
Siddhartha Goyal
committed