Add congressional districts.
Remove water counties for consistency with states.
Update README.md
added Core Based Statistical Areas
Fix typo (s/csba/cbsa/g).
Update README.md
Update README.md
Increase quantization.
Add comment re. node-canvas.
Run uniq and merge before constructing topology.
Try using topojson-merge.
Disable various targets.

Most of these targets aren’t practical (because they generate very large
TopoJSON files that are too large to use), or they need to be rewritten to using
topojson-merge (such as census tracts per state).
Fix link to topojson-merge.
Remove unused variable.
Remove defunct targets.
Use topojson-group to group counties.

Unbeknownest to me, some of the counties (such as Honolulu County, HI, 15003)
were defined as separate polygon features with the same id. Now we use topojson-
group to combine these into multipolygons.
Add topo/us-congress-10m.json rule.
Filter undefined congressional districts.
backing up
adding .idea