On Twitter: @longisland495 The barbershop must be running low on cash. In what has to be deemed as the offseason equivalent of a blindside hit that will get a player flagged 10 yards (or is it 15), Former New York Giants runningback Tiki Barber has pulled a reverse-Brett Favre and has unretired from the NFL. He filed his unretirement papers with the league on Tuesday with intentions to return to p…