A 19-year-old man shot in the head outside a Queens housing project last week has died, police said Tuesday. Johnathan Mendez got into a confrontation outside a Pomonok Houses building on Parson Blvd. near Jewel Ave. about 2 a.m. Feb. 5, cops said. During the clash, a man pulled a gun and shot him in the head. Medics rushed him to New York-Presbyterian Hospital Queens, where he died after ...