Method make_cart_compatible to ensure backwards compatibility afte #587, as per #667
Added test for make_cart_compatible
Method make_cart_compatible to ensure backwards compatibility afte #587, as per #667
Added test for make_cart_compatible
Merge branch '667_cart_compatibility_upgrade' of https://github.com/YaleSTC/reservations into 667_cart_compatibility_upgrade
Change to is_a? Hash as per @orenyk's suggestion
Merge pull request #676 from YaleSTC/667_cart_compatibility_upgrade

Implements cart compatibility upgrade, as per #667.