"Fifty Shades of Grey" helped bookseller Barnes & Noble (BKS) show less red. The largest U.S. traditional book retailer's first-quarter loss was less than analysts had expected thanks to e-books sold for its Nook reader, and strong sales of the saucy, racy and popular "Fifty Shades" trilogy. Barnes & Noble lost 78 cents per share for the quarter that ended July 28, down from a 99-cent-per-share loss a year ago. Analysts were expecting a 98-cent