Update geo/projection/README.md
Easier area-encoded hexbins.
Add keybinding plugin, extracted from the iD project
Merge pull request #31 from tmcw/keybinding

Add keybinding plugin, extracted from the iD project
Add some more unusual projections.

Retroazimuthal:

 * hammerRetroazimuthal
 * littrow
 * craig

Other:

 * armadillo
 * quarticAuthalic
 * wiechel
Add d3.geo.polyhedron.
Remove old TODO.
Add missing epsilon.
Add polyhedral projection inverse.
Fix default hammerRetroazimuthal rotate.
Really fix hammerRetroazimuthal rotation.
Actually fix hammerRetroazimuthal rotation.

Third time lucky!
Only define projection.invert if it exists.

Also, return null instead of [NaN, NaN] if there is no inverse for a
given point.
Standard parallel for Craig projections.
hammerRetroazimuthal: support spheres.

This automates drawing of the projection outline.
Use sphere to generate polyhedron outline.
Add automatic outline for armadillo.
Add automatic outline for berghaus.
Use non-rotated stream for sphere.
Use non-rotated stream for Berghaus sphere.