HEAD-2105: Want download-image.sh to take an optional file (rather than downloading)
HEAD-2105: Want download-image.sh to take an optional file (rather than downloading)

numericillustration/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,numericillustration/sdc-headnode,numericillustration/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode,joyent/sdc-headnode,kaizengarden/sdc-headnode