Shopping Cart enhancements:
	- Demo jspx file to show cart manipulation of cart contents
	- modifying contents works
	- setting qty to zero (0) removes item from cart
	- single "Update Cart" button for entire cart (user can make multiple changes and submit them all at once)
	- Multiple items supported for shopping cart (update/delete via quantity==0 check, loading in items)

Todo:
	- Support removing item immediately from cart (be careful of indices then! Maybe AJAX request here?)
	- Support sales on items when you have specific items in cart