A user can view posts in a paginated list

* install Kaminari gem
* run bundle and the kaminari generator
* modify the generated config/initializers
* modify post model to override default kaminari config
* modify categories controller to implement pagination
* modify category#show to implement pagination
Ah, I see that you've overridden the default name for `page_method_name` and `param_name` in `kaminari_config.rb`. I'm confused by the use of "post" instead of "page" to describe a page.