redirected the page on current cart after adding an album to cart
displayed img_path to current cart
redirected to current cart after deleting line item
added a rescue method in cart to redirect users to public/albums if tried to access invalid cart
added empty_cart button and added functionality to delete cart along with all the line_items in the cart
added total item price and total cart price in the cart
modified add_product to save the album price in the line_item as well