U.S. stock futures were slightly lower this morning, with the Dow futures falling around 0.1% on Friday.Shares of Ross Stores, Inc. ROST fell sharply in today's pre-market trading after the company issued second-quarter EPS guidance below estimates.Ross Stores reported quarterly earnings of $1.47 per share, which beat the Street estimate of$1.44. Quarterly revenue came in at $4.99 billion, which beat the$4.97 billion consensus estimate.Ross Stores said it sees second-quarter GAAP EPS in a range of $1.40 t ...