Testing against Rails 4.1+

bring back with activerecord-deprecated_finders:

* [x] undefined method `apply_finder_options` #322 
* [x] super: no superclass method `scoped`
* [x] ActiveRecord should paginate with_scope: undefined method `with_scope`

more failures:
* [ ] no such column: replies.content
* [ ] undefined method `default_scoped='