strip the file extention of '.shp', if provided, as the shapefile driver does not expect the ext. This allows a directory of shapefiles to be indexed like: 
strip the file extention of '.shp', if provided, as the shapefile driver does not expect the ext. This allows a directory of shapefiles to be indexed like: 

git-svn-id: 5adfda8227e14e59fd47d5bd9925a30df16fed74@2033 d397654b-2ff0-0310-9e29-ba003691a0f9

makinacorpus/mapnik2,craigds/mapnik2,craigds/mapnik2,craigds/mapnik2,craigds/mapnik2,makinacorpus/mapnik2,makinacorpus/mapnik2,makinacorpus/mapnik2