BOULDER, Colo. — A new law that took effect this week makes it illegal to lure children under age 15 through sexually-explicit text messages or cell-phone pictures, signifying a shift in popular technology and giving prosecutors another tool to catch predators. A Colorado law against “Internet luring of a child” previously included just computer communication, but the amended law – which Boulder County District Attorney Stan Garnett said he supports – wraps in cellular technology…