forked from hsuh's block: Force layout constrained
Modified http://d3js.org/d3.v3.min.js to a secure url
Modified http://marvl.infotech.monash.edu/webcola/cola.v2.min.js to a secure url
https://d3js.org/d3.v3.min.js
https://marvl.infotech.monash.edu/webcola/cola.v2.min.js