How permissons bitmask should look like with view/edit/add/remove permissons. How to use it?
<p>User can view/edit/add/remove objects (categories, users, items etc.). What is the best practice to store (in MySQL), manage and check if user have such permissons.</p>

<p><code>Acl</code> class will control if user allowed to execute controller's method or not.</p>

<p>Thank you.</p>
