remove kaminari theme

ActiveAdmin use the default Kaminari theme, thats not nessary to have this theme inside of ActiveAdmin we can use it from the gem.
Merge pull request #3653 from activeadmin/remove_kaminari_theme

remove kaminari theme
fix phantomjs/poltergeist

refs #3623
Fallback to use formtastic inputs
change filters input look up

move all filter inputs in his own namespace to support formtastic input_class_finder with fallback to default inputs.

refs #3633
closes #3678, #3696
Change config.allow_comments to config.comments
Enable comments on per-resource basis
change waffle.io badge style
Merge pull request #3697 from pranas/fix-allow-comments

Fixes for config.allow_comments
list search method conflicts in gotchas docs

[skip ci]
Fix allow_comments= to accept a parameter
Merge pull request #3701 from pranas/fix-allow-comments-deprecation

Fix allow_comments= to accept a parameter