Fix tests with Rails 3.1.x
Fix tests with Rails 3.1.x

Since Rails 3.1 responders return the status 200 without body to put
calls.

See https://github.com/rails/rails/blob/v3.1.4/actionpack/lib/action_controller/metal/responder.rb#L208
and https://github.com/rails/rails/blob/v3.2.2/actionpack/lib/action_controller/metal/responder.rb#L205

telekomatrix/responders,plataformatec/responders,plataformatec/responders,muthhus/responders,gpr/responders,telekomatrix/responders,muthhus/responders,pravi/responders,plataformatec/responders,gpr/responders,pravi/responders