Fixes for deploying to images.joyent.com: update to 0.8.20
Fixes for deploying to images.joyent.com: update to 0.8.20

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