Added support for vectiles TopoJSON multigeometry types
Added support for vectiles TopoJSON multigeometry types

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