Lululemon Athletica's stock price has plummeted this year, but a comeback might be in the works.Why is famed investor Michael Burry going long on Lululemon Athletica (LULU +3.49%)? The guy who was one of the inspirations for the book and later the film "The Big Short" says it's because the stock for this upscale athletic apparel retailer and manufacturer has been oversold and is now a bargain, according to recent statements in his newsletter, Cassandra Unchained. Lululemon needs a comebackWhether he's righ ...