2014-08-29 Gtug girls-20140828 D3.jsを使ってみよう http://www.slideshare.net/muddydixon/gtug-girls20140828 https://github.com/muddydixon/GTUGGIRLSTOKYO20140828 https://github.com/mbostock/d3/wiki/Ordinal-Scales#categorical-colors https://github.com/mbostock/d3/wiki/SVG-Axes#axis