The New York Mets organization has cordially extended invitations to 11 non-roster players to attend spring training."The New York Mets today announced that they signed infielder/outfielder Jolbert Cabrera, infielder Luis Hernandez and lefthanded pitchers Bobby Livingston and Travis Blackley to minor league contracts and invited all four to major league Spring Training camp in Port St. Lucie, Fla. later this month.   Additionally, the team extended major league Spring Training invites to righthanded pitchers Jenrry Mejia and Carlos Muniz, lefthanded pitcher Eric Niesen, catcher Francisco Peña, infielders Ike Davis and Ruben Tejada and outfielder Kirk Nieuwenhuis."