Adding aliases to be able to use Kaminari out of the box

So that pagination looks a bit more like this: https://github.com/rudyrigot/ruby-rails-starter/commit/5f96056ab5ecf8da4f3a358dc62c81794dedbbd8

(no worries, I won't merge that starter project's commit to master, considering how I altered the Gemfile for the prismic.io version; I'll fix it and PR it after this PR is merged)