PHOTO: Two visitors to the LA TIMES Book Festival who bought books pose with our Game Changers of the Century team (L-R): Tanya Hart (Executive Producer), Phil Hart (Executive Producer), patron, Tom Shanahan (author), patron, and Clinton Jones (College Football Hall of Famer signing books). By TOM SHANAHAN I'll write more later on a great weekend at the LA Times Book Festival on the USC campus. But for now, thanks to the Michigan State fans who stopped by,…