Prod page: added cart_message to require / version

cartMessagePush not being defined for productAdd2Cart possilbe cause of
IE 11 hang-up on the way to checkout.
prod page cart_message require / version

Moved cart_message out of prod page require and into the productAdd2Cart
function require.
Also declared cart_message extension w/ an _app.extend in new init.
This should prevent the cartMessage call from coming back undefined and
hanging up IE 11.
Also added cart_message css load back into the extension.
cart message removed from productAdd2Cart / version

cart_message not in use, call removed until such time as it's needed.
merge conflict, version in index