IMGAPI-90 add 'v' image manifest field  (ensure 'v' gets serialized)
IMGAPI-90 add 'v' image manifest field  (ensure 'v' gets serialized)

joyent/sdc-imgapi,joyent/sdc-imgapi,numericillustration/sdc-imgapi,numericillustration/sdc-imgapi,joyent/sdc-imgapi,numericillustration/sdc-imgapi