Autenticazione per aree private

[yoghi]

Va introdotta l'autenticazione (login) per le aree private (upload ASA, profili,...) Es:

• http://help.slimframework.com/discussions/questions/1139-is-this-a-good-slim-twig-authenticate-application
• https://github.com/briannesbitt/Slim-ContextSensitiveLoginLogout/blob/master/index.php