Updated API Reference (markdown)
Link to axis.{inner,outer}TickSize.
Link to d3.geo.{transform,clipExtent}. Also, replace "bounding box" with "rectangle".
Link to d3.pairs.
Add link to cluster.nodeSize.
Add link to tree.nodeSize.
Add d3.geo.graticule.
Add transition.empty.
Add selection.size and transition.size.
Add pack.radius.
Link to d3.time.scale.nice.
d3.geo 3.1