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.
Another trailing comma. The quotes can also be removed from the property names.
I feel like these labels also belong in the CartoConfig object, though that may take a little effort to make sure they don't cause problems with the other charts.