ATSrails_changed @carts in cart index handler to where method instead of all, changed "add_button" submit_tag to button_tag to send params for product_id
ATSrails_added "view cart" link and params for quantity for products added to cart
ATSrails_added session[:cart_id] to create in carts controller
ATSrails_added the deletion of cart from table at logout
ATSrails_set up routes for placing an order