first pass updating the clipping test
first pass updating the clipping test

 - actual results are still slightly broken for agg and clipper
 - todo: try clipper directly rather than through agg interface
 - todo: color polygon parts differently in test renderer

tomhughes/python-mapnik,lightmare/mapnik,pnorman/mapnik,davenquinn/python-mapnik,mapnik/mapnik,mapnik/python-mapnik,tomhughes/python-mapnik,pnorman/mapnik,whuaegeanse/mapnik,naturalatlas/mapnik,mapnik/python-mapnik,garnertb/python-mapnik,stefanklug/mapnik,stefanklug/mapnik,zerebubuth/mapnik,naturalatlas/mapnik,garnertb/python-mapnik,Uli1/mapnik,cjmayo/mapnik,mapycz/python-mapnik,manz/python-mapnik,mbrukman/mapnik,whuaegeanse/mapnik,mapnik/mapnik,Airphrame/mapnik,manz/python-mapnik,mbrukman/mapnik,mapnik/python-mapnik,tomhughes/mapnik,stefanklug/mapnik,jwomeara/mapnik,sebastic/python-mapnik,Airphrame/mapnik,Airphrame/mapnik,Uli1/mapnik,cjmayo/mapnik,zerebubuth/mapnik,lightmare/mapnik,pramsey/mapnik,tomhughes/python-mapnik,garnertb/python-mapnik,CartoDB/mapnik,CartoDB/mapnik,sebastic/python-mapnik,mbrukman/mapnik,stefanklug/mapnik,zerebubuth/mapnik,davenquinn/python-mapnik,tomhughes/mapnik,whuaegeanse/mapnik,CartoDB/mapnik,mapnik/mapnik,tomhughes/mapnik,pramsey/mapnik,Uli1/mapnik,tomhughes/mapnik,yohanboniface/python-mapnik,lightmare/mapnik,Airphrame/mapnik,jwomeara/mapnik,naturalatlas/mapnik,mapnik/mapnik,pnorman/mapnik,mbrukman/mapnik,naturalatlas/mapnik,mapycz/mapnik,Uli1/mapnik,pramsey/mapnik,jwomeara/mapnik,pramsey/mapnik,mapycz/mapnik,jwomeara/mapnik,lightmare/mapnik,sebastic/python-mapnik,manz/python-mapnik,yohanboniface/python-mapnik,mapycz/mapnik,cjmayo/mapnik,cjmayo/mapnik,mapycz/python-mapnik,davenquinn/python-mapnik,yohanboniface/python-mapnik,pnorman/mapnik,whuaegeanse/mapnik