Replaced pass-through setting with an implicit pass on matching mode/format
Replaced pass-through setting with an implicit pass on matching mode/format

TileStache/TileStache,Billups/TileStache,Kosta-Github/TileStache,Kosta-Github/TileStache,mojodna/TileStache,jbants/TileStache,moskvax/TileStache,Blechhirn/TileStache,Billups/TileStache,mojodna/TileStache,mapzen/TileStache,moskvax/TileStache,SEL-Columbia/TileStache,MetGIS/TileStache,TileStache/TileStache,Billups/TileStache,MetGIS/TileStache,mapzen/TileStache,jbants/TileStache,Kosta-Github/TileStache,TileStache/TileStache,SEL-Columbia/TileStache,MetGIS/TileStache,jbants/TileStache,mapzen/TileStache,moskvax/TileStache,Blechhirn/TileStache,SEL-Columbia/TileStache,Blechhirn/TileStache