The San Francisco 49ers announced Saturday that they have signed long snapper Brian Jennings to a five-year contract extension through the 2014 season. Per team policy, financial terms were not released. "When you have a player that is one of the best in the league at his position, you are very lucky when you are able to lock him up for a long time like we have done with Brian," said general manager Scot McCloughan. Jennings, a seventh