permission scheme

 "super_admin"=>
  ["admin",
   "content_create",
   "content_edit",
   "content_delete",
   "category_create",
   "category_edit",
   "category_delete",
   "page_create",
   "page_edit",
   "page_delete",
   "feedback_create",
   "feedback_self_edit",
   "feedback_edit",
   "feedback_self_delete",
   "feedback_delete",
   "user_create",
   "user_edit",
   "user_self_edit",
   "user_delete"],

"admin"=>
  ["content_create",
   "content_edit",
   "content_delete",
   "category_create",
   "category_edit",
   "category_delete",
   "page_create",
   "page_edit",
   "page_delete",
   "feedback_create",
   "feedback_self_edit",
   "feedback_edit",
   "feedback_self_delete",
   "feedback_delete",
   "user_create",
   "user_edit",
   "user_self_edit",
   "user_delete"],

"editor"=>
  ["content_create",
   "content_edit",
   "content_delete",
   "category_create",
   "category_edit",
   "category_delete",
   "page_create",
   "page_edit",
   "page_delete",
   "feedback_create",
   "feedback_self_edit",
   "feedback_edit",
   "feedback_self_delete",
   "feedback_delete"],

"columnist"=>
  ["content_create",
   "content_edit",
   "content_delete",
   "feedback_create",
   "feedback_self_edit",
   "feedback_self_delete"],

 "guest"=>[]