Wesley and mike#56

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wesgriffy wants to merge 2 commits intoConsensys:masterfrom

wesgriffy:WesleyAndMike

Commits on Sep 14, 2018

Implement OpenZeppelin contracts into code, refactor tests to work with new code
tacobellamerica
committed

Commits on Sep 21, 2018

Refactor code to implement openzeppelin contracts, remove compiler warnings and fix tests
tacobellamerica
committed