Separate Kaminari theme

Prevents ActiveAdmin's pagination from being overriden by any
customizations made to the Kaminari views in a Rails app that uses
ActiveAdmin. Fixes gregbell/active_admin#1126.
Fix line-collision on wrapped header titles
update docs with better Strong Parameters examples
update Strong Parameters docs to cover associated destroy
Generate resources with permit_params hints
Merge pull request #2582 from shekibobo/strong-param-generators

Strong param generators
update checkbox-toggler.js.coffee
Fix issue with radio choices styling

Introduced in 2f72a7b945c8a02b4592cd94a06f3d6f0a30fb5f
#2701: fix documentation inaccuracy
update 7-sidebars.md
update 10-custom-pages.md
update 11-decorators.md
update 12-arbre-components.md
add the IRC channel to the README
Merge branch 'master' into kaminari-theme

Conflicts:
	lib/active_admin/views/components/paginated_collection.rb
Rename Kaminari theme to active_admin
sortable has-many
Merge pull request #2656 from igorbernstein/has_many-sortable

sortable has_many
Merge pull request #2048 from jbhannah/kaminari-theme

Separate Kaminari theme
tabs -> spaces