I love the idea of Coin, a device that is aimed at replacing all the credit cards in your wallet with one very cool smart credit card. It has the strip that you swipe on the back and  looks like any other credit card, except instead of colorful logos, it’s sleek and black and has a little display screen in a corner. Coin, though, is really a connected device that can hold and behave like the cards you already carry. Coin works with your debit cards, credit cards, gift cards, loyalty cards and membership cards. Instead of carrying several cards you carry one Coin. Multiple accounts and information all in…