RFD 47: update current status on purge-mg-builds usage
RFD 47: update current status on purge-mg-builds usage

joyent/rfd,joyent/rfd,davepacheco/rfd,davepacheco/rfd,melloc/rfd,rmustacc/rfd,joyent/rfd,melloc/rfd,AnthonyMann/rfd,rmustacc/rfd,melloc/rfd,joyent/rfd,davepacheco/rfd,AnthonyMann/rfd,davepacheco/rfd,davepacheco/rfd