Simple US Map

#134 partial complete

With this, I can only add 1 map widget.  Once #144 gets merged, I'll be able to add more than one.

And I'll add glyphs to it once #143 is merged.

For height/width, it doesn't resize the map, only the div containing the map because d3 wants pixel size, and I don't want to have to do a computation for percentage to pixels.  And changing the x/y positions will put the map over the edge of the workspace, but that's the same behavior as the other widgets.