rails/rails — pull request #18110 by claudiob (2014-12-20 13:39:58+00:00)
Title: Replace guides.ror.org/v4.2.0 with guides.ror.org

No need to point links to http://guides.rubyonrails.org/v4.2.0/... now
that the Ruby on Rails guides point to 4.2.0.