Tabular Summary of Country Census

Suggest doing this with a matrix / grid structure with colouring of boxes.

Similar to d3 calendar (but obviously not calendar): http://mbostock.github.com/d3/talk/20111018/calendar.html or co-occurence: http://bost.ocks.org/mike/miserables/

Note we had a rather simple (not so good) version previously in form of an html table: https://github.com/okfn/opendatacensus/blob/f9ddc6c3424a142273ad02e38a497eda080b83f8/src/app.js#L263