Lululemon Athletica (LULU) stock is trading lower Friday after the athleisure apparel company reported second-quarter results that were mixed compared with analysts' expectations and lowered its full-year outlook.In the quarter ended July 28, Lululemon's revenue increased 7.3% year-over-year to $2.37 billion, driven by a 29% pop in international sales. Its earnings per share (EPS) were up 17.5% from the year-ago period to $3.15."In the second quarter, Lululemon delivered revenue and earnings growth, with on ...