Finally implement recursive directory provider. Fixes #72.
Finally implement recursive directory provider. Fixes #72.

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