Added custom CPLErrorHandler function to ensure errors are logged through python's stdout
Added custom CPLErrorHandler function to ensure errors are logged through python's stdout

Toblerity/Fiona,sgillies/Fiona,perrygeo/Fiona,Toblerity/Fiona,rbuffat/Fiona,johanvdw/Fiona,perrygeo/Fiona,rbuffat/Fiona