By Daniel Kline Fast-food giant McDonald’s has gone full “sun’s out, sesame seed buns out” as it embraces the good weather with new food, menu hacks, and more. Summer means time outside, sun, beaches, maybe throwing a Frisbee, and, of course, crushing up an apple pie and putting it into your McFlurry. That may not be the first thing most people think of when it comes to summer, but McDonald’s (MCD) – Get McDonald’s Corporation Report has a number of promotions designed to put itself into the summer discussion. That’s generally not typical for fast-food burger chains. Wendy’s (WEN) – Get Wendy’…