improve configure by enforcing viable mapnik-config script by checking mapnik svn-revision of trunk (if we are configureing with AUTOCONFIGURE which looks for mapnik-config (only available with mapnik2))
improve configure by enforcing viable mapnik-config script by checking mapnik svn-revision of trunk (if we are configureing with AUTOCONFIGURE which looks for mapnik-config (only available with mapnik2))

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