d3 glucose heatmap

[Benjamin West]

I was inspired by Jana's heatmaps and conversations with Joyce Lee, and have started implementing similar charts in d3.js.

Here was a warmup: http://bl.ocks.org/bewest/5075497

https://gist.github.com/bewest/5075497

Hopeful for more to come.

Once we have a suite of nice panels, I plan to integrate it all using dc.js or something like square's demo of crossfilter.

-bewest