-b / --bboxes doesn't handle crossing the antimeridian well

[mfogel]

When the -b / --bboxes option is used, the bounding box calculated for the subject doesn't handle shapes that cross the antimeridian well. Instead of forming a small bounding box that crosses the antimeridian, it forms one that wraps around the other side of the globe in one big band.

This geojson spec describes the preferred way to handle this situation. The bounding box should not be considered to be [minX, minY, maxX, maxY], but rather [W, S, E, N] limits of the shape.