Merge pull request puppetlabs#817 from DavidS/install-staging-acceptance

(maint) Add missing nanliu/staging module

Author: tphoney

spec/spec_helper_acceptance.rb

@@ -49,6 +49,7 @@
       else
         on host, puppet('module','install','puppetlabs-stdlib','--version','3.2.0')
         on host, puppet('module','install','stahnma/epel')
+        on host, puppet('module','install','nanliu/staging')
       end
     end
   end