Bump responders from 2.4.1 to 3.0.0 in /test/rails_51 (#521)
Bump responders from 2.4.1 to 3.0.0 in /test/rails_51 (#521)


activeadmin/inherited_resources,activeadmin/inherited_resources,activeadmin/inherited_resources,josevalim/inherited_resources,josevalim/inherited_resources,josevalim/inherited_resources