Based on: a study of the World Economic Forum http://www.weforum.org/issues/global-information-technology
Inspired by: NY Times article http://www.nytimes.com/interactive/2013/05/25/sunday-review/corporate-taxes.html?_r=0
Uses: D3.js http://d3js.org/ and code from http://fiddle.jshell.net/6cW9u/8/