Authorization with Pundit doesn't allow Policy Namespacing

Punditize assumes that there is no Pundit Policy Namespacing being used. If we allow namespaces, we could even avoid the custom policy_scope_admin.

Quick work around is, instead of including Punditize, to use the following code:

# All Administrate controllers inherit from this `Admin::ApplicationController`,
# making it the ideal place to put authentication logic or other
# before_actions.
#
# If you want to add pagination or other controller-level concerns,
# you're free to overwrite the RESTful controller actions.
module Admin
  class ApplicationController < Administrate::ApplicationController
    include Pundit

    def policy_scope(scope)
      super([:admin, scope])
    end

    def authorize(record, query = nil)
      super([:admin, record], query)
    end

    def scoped_resource
      policy_scope super
    end

    def authorize_resource(resource)
      authorize resource
    end

    def show_action?(action, resource)
      Pundit.policy!(pundit_user, [:admin, resource]).send("#{action}?".to_sym)
    end

  end
end