Added a .gitignore file. Will ignore the build directory and Xcode user files.
Added a .gitignore file. Will ignore the build directory and Xcode user files.

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