LotteryHUB, a mobile app made by Austin-based Shoutz Inc., has been named the official app of the Mega Millions and Powerball lotteries, the company announced Tuesday. LotteryHUB's app will serve as the official mobile video host of the weekly drawings for the two lotteries, which are played by more than 120 million Americans every month. It also allows players to check jackpots, track numbers, and receive lottery-related news. Financial terms of the deal are not public. The app can be downloaded…