Feature/barcharts

D3 complains of NaN when trying to update the temporal (but not the areal) graph. I've looked at the data which is getting passed to it and I can't figure out where that NaN is coming from.

A second pair of eyes would be much appreciated.
There are more trailing commas in this file too. It'd be worth getting set up with jshint in your editor, because this causes major problems in a lot of versions of IE.