Added synopsis for module.
Added synopsis for module.

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