build: add .lbox.check
build: add .lbox.check

This will check for formatting issues, both at proposal time
and at submit time (on the merged branch). It requires an
up-to-date lbox to work.

R=
CC=
https://codereview.appspot.com/6503109

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