A 25-year-old man was stabbed to death inside the Flatiron club Duvet early Friday morning. Shamel McKinsey stumbled outside and collapsed outside on West 21st street, "blood gushing from his wounds, just after 3:30 a.m.," according to the Daily News. McKinsey, who had an arrest record for drug possession with intent to sell, was pronounced dead at St. Vincent's Hospital. Police suspect that McKinsey may have been partying with the rapper Fabolous at Duvet,......