Mapbuilder

[petulla]

To-do's:

[] Fix some hardcoding of colors/styles [] Add documentation [] Fix inline-commenting of code units [] Fix labeling issues on cartograms for non-50 state maps [] Optimize topojson for world/state maps [x] Improve default datasets [] Improve color schemes [] Fix precision issue [] Fix cross zero issue [] Add state outlines to county-level maps [] Fix state-level Cartogram maps

[petulla]

@nsonnad I'll be prepping this for when you are back.

[petulla]

@nsonnad Still got some ways to go on this fyi. But would be good to regroup soon.