list of articles for index page
add "destroy" action
gem install 'cancan'
gem install 'rolify'
'cancan' => 'ability'
'rolify' => 'rol
rake db:migrate
create first ability, for admin user
redirect to haven't got permission for entry to controller/action
another alternatives to admin rol
include code for restric with rol access
add div with Article options for admin user
refactor: list of articles for index page
refactor: list of articles for index page
refactor: show article add 'article actions'
refactor ability with 'author' role