Mastercard is getting a new CEO. Home Depot grows 4th-quarter profits. Shake Shack falls as 4th-quarter sales growth slows. Jason Moser analyzes those stories, and shares 3 European stocks as we dip into the Fool Mailbag. (For a FREE copy of our Investing Starter Kit, go to\xa0www.fool.com/StarterKit\xa0and we\u2019ll email it to you.)