Mara has “nothing to report yet” on possible Eli extension

For the three 2004 first-round quarterbacks not named J.P. Losman, 2015 began as a contract year.  For one (Philip Rivers), 2015 likely will end without a new deal.  For another (Ben Roethlisberger), a new contract already has been finalized. For Eli Manning, who knows? In a Thursday session with New York media, Giants co-owner John…