pygeoif

999344dd - add "bbox" to __geo_interface__ output

add "bbox" to __geo_interface__ output http://www.geojson.org/geojson-spec.html#bounding-boxes Most geometry and feature objects already had a bound method to determine the bounding box coordinates but the coordinates were not being added to the __geo_interface__ output under the "bbox" member. It is unclear what is the proper way to handle the "bbox" member for points. Can/should a point have a bbox? Since the bbox member is optional I am omitting it from point objects.