Fix reading of build_version from manifest files.
Fix reading of build_version from manifest files.

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