views/bruschetta/index.html.haml: if user is not logged in, no buttons for 'mostra, modifica, eliminare' appear
vews/ingredients: if user is not logged in, no buttons for 'mostra, modifica, mostra' appear; = if ... --> - if (remember strange text that appeared due to = instead of - in front of if\!)
views/items: no possibility to modify or destroy if not logged in
views/sandwiches: no modifica, elimina if not logged in
default layout is added to controllers
shopping cart is now displayed in layout