avoid taking const& to a copy (which is what is returned from geom.envelope() currently)
avoid taking const& to a copy (which is what is returned from geom.envelope() currently)

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