exec_bundle_command

# File railties/lib/rails/generators/app_base.rb, line 628
      def exec_bundle_command(bundle_command, command, env)
        full_command = %["#{Gem.ruby}" "#{bundle_command}" #{command}]
        if options[:quiet]
          system(env, full_command, out: File::NULL)
        else
          system(env, full_command)
        end
      end