Add auto ID generation to POST API callback.
Add auto ID generation to POST API callback.

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