Add uncompressed layer media type
Add uncompressed layer media type

Signed-off-by: Derek McGowan <e1c79a582b6629e6b39e9679f4bb964d25db4aa8@mcgstyle.net> (github: dmcgowan)

konnase/distribution,konnase/distribution,mikebrow/distribution,thaJeztah/distribution,dmcgowan/distribution,sergeyfd/distribution,jwhonce/distribution,mikebrow/distribution,estesp/distribution,spacexnice/distribution,cezarsa/distribution,vdemeester/distribution,dmcgowan/distribution,duglin/distribution,sadlil/distribution,jwhonce/distribution,docker/distribution,estesp/distribution,thaJeztah/distribution,docker/distribution,huamai-io/distribution,yuwaMSFT2/distribution,shyr/distribution,manoj535/distribution,jzwlqx/distribution,miminar/distribution,yuwaMSFT2/distribution,jzwlqx/distribution,manoj535/distribution,sergeyfd/distribution,harrisonfeng/distribution,konstruktoid/distribution,miminar/distribution,duglin/distribution,spacexnice/distribution,cezarsa/distribution,huamai-io/distribution,harrisonfeng/distribution,vdemeester/distribution,sadlil/distribution,konstruktoid/distribution,shyr/distribution