Using tract' cbsa, shade any tracts outside of the metro and hide any bubbles that would appear there
Set a min and max zoom level for the map
Merge branch 'master' of https://github.com/cfpb/mapusaurus into shade-outside-bounds
Merge pull request #76 from cmc333333/shade-outside-bounds

Shade areas outside locked metro
Merge pull request #77 from cmc333333/min-max-zoom

Set a min and max zoom level for the map
Merge upstream