very simple example showing Origin and Destination in table
got basic breakdown of all pairs of geohash level 2 origin, dest pairs
based on looking at source of dc.js (naughty) override colorCalculator to use a d3 linear range
misc workspace
playing with barCharts; not really working because there is so many points on scale, and scale is ordinal
go back to just bar chart, and level 2 geohash
Merge branch 'basic-visualisation'