When North Texas men’s basketball coach Grant McCasland was booking flights and hotels for his family to attend the NCAA Tournament in Indianapolis, he set the return date for Monday. He had no plans for his family to attend just one game in the win-or-go-home tournament. “We just believed we were doing it,” McCasland said. “You don’t approach it any other way.” The Mean Green “did it” to say the least. They’re one of the Cinderellas of this year’s March Madness, stunning 4-seed Purdue in overtime, 78-69, on Friday night. It marked the first NCAA Tournament victory for the North Texas program….