Fix casing on DeKalb, McIntosh and McDuffie counties
Add tooltips
Convert decimal percents to whole numbers in parser
Round percents instead of truncating
Add " County" to county name display field
Add color buckets

These will be edited later to avoid shading a district as
underrepresented in either direction if the addition or subtraction of
one black reprepresentative would tip the scales in the other direction
Add filter buttons

Still needs some styling work
Make sure selection is on top on hover

SVG does not support Z-index, so in order to get this element on top it
needs to re-attached to the top of the SVG element in the DOM
Use class for styling hover state
Create README
More visual differentiation on filters
Hover stroke in blue to differentiate from filter selection
Clicking an active filter restores default (filterless) map state

Switched from radio buttons to regular buttons since we have to set the
active state manually anyway now