add clean and clobber steps to rake tasks
add clean and clobber steps to rake tasks

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