Add support for referer in the URL template provider.
Add support for referer in the URL template provider.
MetGIS/TileStache,robpvn/Vector-Tile-Research,jbants/TileStache,Blechhirn/TileStache,Billups/TileStache,jbants/TileStache,robpvn/Vector-Tile-Research,mapzen/TileStache,MetGIS/TileStache,mapzen/TileStache,Billups/TileStache,TileStache/TileStache,Kosta-Github/TileStache,mpuig/TileStache,SEL-Columbia/TileStache,Billups/TileStache,mpuig/TileStache,SEL-Columbia/TileStache,Blechhirn/TileStache,Blechhirn/TileStache,moskvax/TileStache,MetGIS/TileStache,jbants/TileStache,mojodna/TileStache,robpvn/Vector-Tile-Research,SEL-Columbia/TileStache,Kosta-Github/TileStache,TileStache/TileStache,moskvax/TileStache,TileStache/TileStache,moskvax/TileStache,Kosta-Github/TileStache,mojodna/TileStache,mapzen/TileStache