not related to this PR, but I'm not sure why so many delegation methods - should be simply
``` ruby
delegate :filter_manager, :ordering_registry, :inclusion_filter, :exclusion_filter, :configure_group, :reporter, :run_all_when_everything_filtered?, 
   :to => :configuration
```
see:
https://github.com/rails/rails/blob/master/activesupport/lib/active_support/core_ext/module/delegation.rb