Spec to test handling slices as a resource
Spec to test handling slices as a resource

1. Should work for newer slices versions
2. Should not break for older versions
3. TODO: Should not break for no slices at all 
sideci-sample/sideci-sample-psd.rb,excid3/psd.rb,layervault/psd.rb,etanlubeck/psd.rb,jamesbeat/psd.rb