BARRE, Vt. – A little boy who stole the hearts of Vermonters with his fight against a rare blood disorder has died. We first met Drew Bernier two years ago when he was 6 and in need of a bone marrow transplant. The Barre community rallied to help pay his medical expenses. And last spring, classmates held a rally at school dressed up like superheroes in honor of Drew, who they…