Don't forget to tip your barista when you're paying with your phone app

OK, Starbucks baristas, you've got at least one customer on your side in the tipping debate. Al Sacco writes: "The Dunkin' and Starbucks apps make it quicker and easier for people to pay for their coffee, assuming they know how to use them and don't fumble with their phones for five minutes every time they try to pay. But the cards also do away with the change customers receive after paying....