update bundler
update bundler

It seems changes in the travis environment are
going to require us to update bundler to have
a working bunder/rubygems pair

szechyjs/omnibus,DataDog/omnibus-ruby,Altiscale/omnibus,higanworks/omnibus,strangelittlemonkey/omnibus,Altiscale/omnibus,rapid7/omnibus,szechyjs/omnibus,szechyjs/omnibus,Scalr/omnibus,Altiscale/omnibus,rapid7/omnibus,strangelittlemonkey/omnibus,Scalr/omnibus,strangelittlemonkey/omnibus,rapid7/omnibus,jamesn/omnibus,jamesn/omnibus,higanworks/omnibus,chef/omnibus,chef/omnibus,higanworks/omnibus,DataDog/omnibus-ruby,DataDog/omnibus-ruby,chef/omnibus,Scalr/omnibus,jamesn/omnibus