Allow TinyAuth as component to hook into authentication globally

[dereuromark]

via authentication.ini

This is fully optional and replaces controller code like

    public function beforeFilter(Event $event) {
        parent::beforeFilter($event);
        $this->Auth->allow(['index', 'add']);
    }

FEEDBACK:

• I am thinking about calling the file allow.ini to make it clear this is not authentication requirements but what is whitelisted to be publically accessible.

[dereuromark]

@bravo-kernel Any feedback?