Barkevious Mingo trying to gain weight, “psyched” to play for Mike Pettine

For most people, the inability to put on weight despite eating pizzas loaded with fattening toppings would be an enjoyable trait to have. For Browns linebacker Barkevious Mingo, though, it is a problem. The Browns want Mingo, who was listed at 240 pounds in his rookie season, to be heavier when the 2014 season gets…