refs #1489: close file handle when done
refs #1489: close file handle when done

florianf/tileoven,fxtentacle/tilemill,mbrukman/tilemill,Zhao-Qi/tilemill,fxtentacle/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,mbrukman/tilemill,MappingKat/tilemill,fxtentacle/tilemill,Zhao-Qi/tilemill,tizzybec/tilemill,paulovieira/tilemill-clima,Teino1978-Corp/Teino1978-Corp-tilemill,tilemill-project/tilemill,MappingKat/tilemill,florianf/tileoven,paulovieira/tilemill-clima,fxtentacle/tilemill,Zhao-Qi/tilemill,florianf/tileoven,tilemill-project/tilemill,paulovieira/tilemill-clima,nyimbi/tilemill,MappingKat/tilemill,paulovieira/tilemill-clima,Teino1978-Corp/Teino1978-Corp-tilemill,Zhao-Qi/tilemill,fxtentacle/tilemill,mbrukman/tilemill,tizzybec/tilemill,paulovieira/tilemill-clima,nyimbi/tilemill,MappingKat/tilemill,mbrukman/tilemill,nyimbi/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,nyimbi/tilemill,nyimbi/tilemill,tilemill-project/tilemill,tizzybec/tilemill,tizzybec/tilemill,Zhao-Qi/tilemill,MappingKat/tilemill,mbrukman/tilemill,Teino1978-Corp/Teino1978-Corp-tilemill,tizzybec/tilemill