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.
This function for getting the sq. ft. value is used quite a few times here, and should probably be abstracted out. It would also help reduce the length of these lines which are getting pretty long.