Update the add machine api to accept both environment name and UUID.
Update the add machine api to accept both environment name and UUID.

mjs/juju,Altoros/juju-cloudsigma,cherylj/juju,mikemccracken/juju,perrito666/juju,gabriel-samfira/juju,kat-co/juju,wwitzel3/juju,gabriel-samfira/juju,mikemccracken/juju,cherylj/juju,macgreagoir/juju,AdamIsrael/juju,kat-co/juju,dooferlad/juju,bac/juju,perrito666/juju,jrwren/juju,kat-co/juju,tsakas/juju,tsakas/juju,thomnico/juju,marcmolla/juju,howbazaar/juju,mhilton/juju-juju,cloud-green/juju,alesstimec/juju,cmars/juju,howbazaar/juju,davecheney/juju,bogdanteleaga/juju,mikemccracken/juju,ericsnowcurrently/juju,dimitern/juju,waigani/juju,Altoros/juju-vmware,bz2/juju,tasdomas/juju,axw/juju,makyo/juju,marcoceppi/juju,Altoros/juju-vmware,axw/juju,marcoceppi/juju,macgreagoir/juju,Altoros/juju-cloudsigma,bac/juju,cherylj/juju,AdamIsrael/juju,anastasiamac/juju,Altoros/juju-cloudsigma,fwereade/juju,makyo/juju,macgreagoir/juju,reedobrien/juju,frankban/juju,perrito666/juju,ericsnowcurrently/juju,Altoros/juju-vmware,anastasiamac/juju,alesstimec/juju,gabriel-samfira/juju,frankban/juju-tmp,axw/juju,gabriel-samfira/juju,alesstimec/juju,frankban/juju,tsakas/juju,mhilton/juju-juju,sinzui/juju,waigani/juju,bac/juju,cherylj/juju,bogdanteleaga/juju,axw/juju,makyo/juju,tych0/juju,mhilton/juju,frankban/juju-tmp,voidspace/juju,frankban/juju,bz2/juju,tasdomas/juju,mhilton/juju,mhilton/juju-juju,tasdomas/juju,tasdomas/juju,ericsnowcurrently/juju,jrwren/juju,mhilton/juju,wwitzel3/juju,dimitern/juju,marcmolla/juju,sinzui/juju,howbazaar/juju,marcoceppi/juju,kat-co/juju,bac/juju,davecheney/juju,bogdanteleaga/juju,gabriel-samfira/juju,waigani/juju,dooferlad/juju,fwereade/juju,perrito666/juju,cloud-green/juju,macgreagoir/juju,wwitzel3/juju,cmars/juju,tych0/juju,mhilton/juju,thomnico/juju,mikemccracken/juju,bac/juju,frankban/juju,reedobrien/juju,mjs/juju,waigani/juju,wwitzel3/juju,frankban/juju-tmp,cloud-green/juju,dimitern/juju,frankban/juju,voidspace/juju,mjs/juju,axw/juju,howbazaar/juju,kat-co/juju,thomnico/juju,marcoceppi/juju,dooferlad/juju,perrito666/juju,ericsnowcurrently/juju,cloud-green/juju,tych0/juju,jrwren/juju,davecheney/juju,Altoros/juju-vmware,macgreagoir/juju,alesstimec/juju,tsakas/juju,mhilton/juju-juju,dimitern/juju,alesstimec/juju,frankban/juju-tmp,mjs/juju,thomnico/juju,makyo/juju,fwereade/juju,sinzui/juju,dooferlad/juju,davecheney/juju,ericsnowcurrently/juju,mjs/juju,Altoros/juju-cloudsigma,bogdanteleaga/juju,reedobrien/juju,anastasiamac/juju,anastasiamac/juju,bz2/juju,reedobrien/juju,bz2/juju,dimitern/juju,fwereade/juju,tych0/juju,mjs/juju,dooferlad/juju,voidspace/juju,anastasiamac/juju,sinzui/juju,reedobrien/juju,mjs/juju,marcmolla/juju,howbazaar/juju,marcmolla/juju,cmars/juju,AdamIsrael/juju,bz2/juju,marcmolla/juju,voidspace/juju,AdamIsrael/juju,cmars/juju,mikemccracken/juju