Those of you living in a city graced by Square's Card Case have been gleefully opening tabs and making plastic-free payments at select merchants since May. Starting today, iPhone users will now save precious seconds of shopping time as opening tabs has been automated -- as soon as you're close enough to designated establishments, tabs open themselves courtesy of new geo-fencing APIs exposed in iOS 5. For those who are unfamiliar, the previous iPhone and Android apps required users to manually open those tabs from within the vicinity of a Square-approved merchant. After that, users complete purchases as be
