Remove 10.10 support. Refs #1215.
Remove 10.10 support. Refs #1215.

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