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.
If you want to user to be able to override any of the things you defined in the BarChartsDefaultSqft object above, they need to be defined here as well.