NEW YORK (Reuters) – The heyday of Beatlemania may have been nearly 50 years ago, but the Beatles and their music remain loved, scrutinized and relevant to an adoring public forever clamoring for more details of the Fab Four. A new book, "LIFE With the Beatles," gives an inside peek at the band that split up in 1970. It features hundreds of never-before-seen and rare photos by the late Robert Whitaker, who was granted generous access to John, Paul, George and Ringo from 1964 to 1966. …