Attempting to use D3 with React v16
forked from Fasani's block: React V16 + D3 + Force
Modified http://d3js.org/d3.v3.min.js to a secure url
https://unpkg.com/babel-standalone@6.26.0/babel.min.js
https://unpkg.com/react@next/umd/react.production.min.js
https://unpkg.com/react-dom@next/umd/react-dom.production.min.js
https://cdn.jsdelivr.net/npm/create-react-class@15.6.0/create-react-class.min.js
https://d3js.org/d3.v3.min.js