Moved to <http://bl.ocks.org/4060606>.
Moved to <http://bl.ocks.org/4206573>.
Moved to <http://bl.ocks.org/4206857>.

Moved to <http://bl.ocks.org/843177>.
Moved to <http://bl.ocks.org/4055892>.
Moved to <http://bl.ocks.org/4055889>.

Moved to <http://bl.ocks.org/2066421>.
Moved to <http://bl.ocks.org/2066415>.

Moved to <http://bl.ocks.org/1005090>.

Moved to <http://bl.ocks.org/3887193>.

Moved to <http://bl.ocks.org/972398>.

Moved to <http://bl.ocks.org/4063530>.

Moved to <http://bl.ocks.org/4061502>.

Moved to <http://bl.ocks.org/1243323>.

Moved to <http://bl.ocks.org/1096355>.

Moved to <http://bl.ocks.org/4339184>.

Moved to <http://bl.ocks.org/4060366>.

Moved to <http://bl.ocks.org/3943967>.

Moved to <http://bl.ocks.org/4060954>.

Moved to <http://bl.ocks.org/4063423>.

Moved to <http://bl.ocks.org/4063582>.

Moved to <http://bl.ocks.org/4339083>.

Moved to <http://bl.ocks.org/4241134>.

Available at <http://bl.ocks.org/999346>.

Available at <http://bl.ocks.org/1276463>.

Available at <http://bl.ocks.org/1256572>.

Moved to <http://bl.ocks.org/4063550>.

Moved to <http://bl.ocks.org/4062085>.

This reverts commit c3635192.

This avoids string concatentation on fractional p-values.

The south pole rotation could result in line segments that go through
the poles.  These are characterised by a 180° longitudinal difference.
These cases were not handled properly by the approximation algorithm,
but it now handles both north and south pole cases.

Only the area sign is needed to determine the polygon winding order, so
a fast approximation is sufficient.

U.S. counties benchmark: 84ms/op → 51ms/op.