improves login and implements it properly and fully working
improves edit method security
improves update method security
unnecessary lines removed
tweet class, controller and views updated; everything's working (list, edit, update, create, save, delete)
action/controller fixed on g link tag
action/controller fixed again on g link tag
added delete account link under edit form
check user method improved to avoid deleted users to login and to still use web site functions
g link tag fixed once more; id attribute was missing
logout link added
bug fixes