Altered Product#find_by_handle to use the new 'lookup' endpoint of the products API.
Altered Product#find_by_handle to use the new 'lookup' endpoint of the products API.

elfotografo007/chargify_api_ares,carsonreinke/chargify_api_ares,wsmoak/chargify_api_ares,chargify/chargify_api_ares,chase439/chargify_api_ares,outstand/chargify_api_ares