add support for proc build commands
add support for proc build commands

we need the lazy evaluation so that we can read out the list of software
versions after all software files have been loaded.

rhass/omnibus,adamleff/omnibus,servebox/omnibus,hugosato/omnibus,jamesn/omnibus,ashhher3/omnibus,lvfeng1130/omnibus,szechyjs/omnibus,DataDog/omnibus-ruby,sh9189/omnibus,3ofcoins/chef-omnibus,DataDog/omnibus-ruby,mattray/omnibus,hugosato/omnibus,szechyjs/omnibus,rapid7/omnibus,3ofcoins/chef-omnibus,pskrz/omnibus,3ofcoins/chef-omnibus,chef/omnibus,DataDog/omnibus-ruby,higanworks/omnibus,rapid7/omnibus,pskrz/omnibus,strangelittlemonkey/omnibus,intfrr/omnibus,higanworks/omnibus,ashhher3/omnibus,Altiscale/omnibus,lvfeng1130/omnibus,mattray/omnibus,ashhher3/omnibus,adamleff/omnibus,hugosato/omnibus,Altiscale/omnibus,rapid7/omnibus,pskrz/omnibus,jamesn/omnibus,strangelittlemonkey/omnibus,mattray/omnibus,servebox/omnibus,rhass/omnibus,sh9189/omnibus,Scalr/omnibus,intfrr/omnibus,Scalr/omnibus,sh9189/omnibus,intfrr/omnibus,lvfeng1130/omnibus,Scalr/omnibus,Altiscale/omnibus,jamesn/omnibus,adamleff/omnibus,higanworks/omnibus,chef/omnibus,chef/omnibus,rhass/omnibus,servebox/omnibus,szechyjs/omnibus,strangelittlemonkey/omnibus