[ic] Massive quantity bug with Certain chrome versions

[Peter]

This is a heads up for those running old Foundation shops, and possibly
others (not sure to which other demos this extends).  Specific versions
of the Chrome browser (51.0.2704.81 and 51.0.2704.103) on seemingly all
platforms (confirmed Windows 10, Android and Linux) seem to have a
tendency to want to auto-fill in the user's zip code in the quantity0
field of the shopping cart on the single checkout page.  This has the
result of customers inadvertently placing orders with five, and nine
digit quantities in there, resulting in attempted charges of millions of
dollars to their credit cards.

The simple fix is to add autocomplete="off" to the quantity input in
include/checkout/shopping_cart.  This should also be added to other
fields throughout the demo where the browser has no business trying to
auto-fill data.


Peter