Austin boxed cocktail startup BeatBox Beverages secured a $1 million investment for a one-third stake in the company from entrepreneur Mark Cuban during an episode of ABC's "Shark Tank" that aired Friday night. Company officials said they have been flooded with calls since the episode aired from companies looking to distribute their products. The capital from the Dallas billionaire will help the company, which launched in 2013 and has yet to reach $1 million in total revenue, expand quickly through…