Written by DCist Contributor Eric Denman As the commercialization of Chinatown persists, the number of restaurants and bars continues to increase. For every existing grungy Chinese takeout place, there is a new sports bar, burger joint, or wine bar. Proof, which opened in July, is the newest entry in the Chinatown wine bar field, and it opened a mere block from the established José Andrés outpost Zaytinya (which has been open since 2002). Both places…