As a gust of wind from a New York City subway grate sent Marilyn Monroe’s white dress fluttering past her legs, cameras captured what would become the “shot seen ’round the world.” The 1955 comedy “The Seven Year Itch” — arguably the star’s most iconic film — turned 70 this year. The family of photographer Sam Shaw, Monroe’s close friend whose now-famous images cemented her status as a sex symbol, has released a new book , “Dear Marilyn: The Unseen Letters and Photographs.” It reveals the