Add .gitignore.
Add .gitignore.

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