rails/routing_concerns — pull request #7 by pierre-schambacher (2013-03-15 10:38:40+00:00)
Title: Extend concerns to scopes and namespaces.

As for now routing concerns were only available for resources.
Some people may need it for scopes or namespace to DRY their routes.

Fix https://github.com/rails/routing_concerns/issues/4
I'll do the same directly in Rails4 since this gem is just supposed to be backward compatibility.