Fix two-point azimuthal.
Bump version.
Fix thumbnails in README.

Fixes #2.
Fix for detached polygons when projecting.

Work-around for mbostock/d3#1558.
Bump version.
Sort-of fix Berghaus. Related #57.
Fix Berghaus clip region.

The tips of the lobes were coincident at [180°, 0°], which caused issues
with D3’s clipping.  Instead, we generate a circle around [180°, 0°]
with an appropriate number of points, and use these as the lobe tips.

Fixes #3.
Better Berghaus clip region.

The previous fix didn't seem to work properly for even numbers of lobes.
This fix should be slightly faster and it also works for
projection.clipAngle(180 - 1e-5).