upgrade bundled clipper to https://github.com/mapnik/clipper/commit/262cf40a180b76e5c4321bf4add7d1475fe30f4d - refs mapbox/mapnik-vector-tile#111
upgrade bundled clipper to https://github.com/mapnik/clipper/commit/262cf40a180b76e5c4321bf4add7d1475fe30f4d - refs mapbox/mapnik-vector-tile#111

langateam/node-mapnik,CartoDB/node-mapnik,stefanklug/node-mapnik,stefanklug/node-mapnik,tomhughes/node-mapnik,tomhughes/node-mapnik,tomhughes/node-mapnik,MaxSem/node-mapnik,langateam/node-mapnik,CartoDB/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik,Uli1/node-mapnik,langateam/node-mapnik,MaxSem/node-mapnik,tomhughes/node-mapnik,MaxSem/node-mapnik,mapnik/node-mapnik,langateam/node-mapnik,stefanklug/node-mapnik,Uli1/node-mapnik,CartoDB/node-mapnik,mapnik/node-mapnik,mapnik/node-mapnik,stefanklug/node-mapnik,Uli1/node-mapnik,Uli1/node-mapnik,tomhughes/node-mapnik,mapnik/node-mapnik,CartoDB/node-mapnik,MaxSem/node-mapnik,CartoDB/node-mapnik