Add destructive button class.
Add destructive button class.

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