1-Added new section in the navigation bar for unregister user. Here they
can register to Raining Mail
2-Improved login method, now i'm using sessions for manage users log
3-Changes in the navigation bar, we redefined buttons that replace the
old buttons used for add new contacs, show list of subscribers ecc
4-Improved page access from unauthenticated users, if they can't view a
page i've add a method that push them into the index page where i add an
alert message