Wall Street Journal writer Jeffrey Zaslow, who recently collaborated on Arizona Rep. Gabrielle Giffords’ memoir, was killed Friday when he crashed into a truck in northern Michigan. http://online.wsj.com/article/SB10001424052970203646004577215574045345682.html?mod=WSJ_hp_mostpop_read Zaslow, an award-winning writer, was 53, according to The Journal. He was traveling…