forked from dk8996's block: D3.js Gantt Chart, example 3
Modified http://d3js.org/d3.v3.min.js to a secure url
Modified http://static.mentful.com/gantt-chart-d3v2.js to a secure url
https://d3js.org/d3.v3.min.js
https://static.mentful.com/gantt-chart-d3v2.js