sketch single-cell
test for cardboard.export. refs #53
remove dumpGeoJSON
change geometryid to s3url and always put geobuf to S3
use a tile based index
tilebelt dependency
cover in case tileToQuadKey results in an empty string
bump tilebelt and adjust bboxQuery. test around 0 lat/lng
Merge pull request #56 from mapbox/single-cell

Single cell / tile-based index