The most basic map using d3js v4.0. Just to learn a little about using the new version...
Modified http://d3js.org/topojson.v1.min.js to a secure url
https://d3js.org/d3-array.v1.min.js
https://d3js.org/d3-geo.v1.min.js
https://d3js.org/d3-selection.v1.min.js
https://d3js.org/d3-collection.v1.min.js
https://d3js.org/d3-dispatch.v1.min.js
https://d3js.org/d3-request.v1.min.js
https://d3js.org/topojson.v1.min.js