Fans of new CBS dramas “Vegas” and “Elementary” can breath a sigh of relief. The network announced on Tuesday that it would be picking up both shows for a full season. “Vegas,” which stars Dennis Quaid and Michael Chiklis, has been averaging around 15 million viewers per episode. The Jonny Lee Miller and Lucy Liu-helmed “Elementary” averages $14.3 million. This are the first full orders for CBS so far this season.