TODO

ActiveSupport helper methods:
  - Write specs for active_level_for
  - Write specs for active_item_for if it getting block
  - Write specs for skip_for property
  - Make skip_for property work with other renderers
  - Write wiki about that

Concept:
  - Rewrite leaf/node concept
  - Add possible to define renderers as templates
  - Add renderers for other template frameworks
  - Move bootstrap renderers to bootstrap version 4.0.0
  - Possible to make dynamic items in menu (database or something else)
  - Pattern routes, can accept Proc
  - active_if method, can accept Proc
  - add possibility for routes like {controller: 'some_controller', actions: ['index', 'new', 'create']}, or
    "some_controller#(index|new|create)"
  - add wrap_false property for item
  
Convention over configuration:
  - Move menu definitions outside the initializers folder
  - Leave menu configuration options in initalizers folder