Replace existing tile.openstreetmap.org coastline files with openstreetmapdata.com files

Closes gravitystorm/openstreetmap-carto#39

Also index the shapefiles for performance as the new ones don't come pre-indexed
Remove built up areas from shapefile from z10. It is not visible under all the residential roads.
Merge pull request #63 from pnorman/coastline_files

Replace existing tile.openstreetmap.org coastline files with openstreetmapdata.com