By Kirk Miller Attaboy is a tiny bar discreetly tucked away on New York City’s Lower East Side. The narrow 500-square-foot space occupies the former home of Milk & Honey, a speakeasy started by the late Sasha Petraske that sparked the current cocktail renaissance. Like that legendary bar, Attaboy works with minimalist flair — there’s no menu and the number of ingredients in each drink is purposely limited. Until last night, you could argue that it’s the best bar on the continent. And now, that claim is official: Attaboy was crowned “The Best Bar in North America” at the inaugural North America…