Ronald Bronstein is the co-writer, editor, and co-producer of Marty Supreme , and Mary Bronstein is the writer and director of If I Had Legs I’d Kick You . After nearly two decades of trudging through the indie-film world, the husband and wife both have movies nominated for Oscars at the same time. Photo: Dimitrios Kambouris/Getty Images Filmmakers Mary and Ronald Bronstein met while making a movie, of course — Frownland , a gloriously abrasive 2007 indie that remains the first and only feature