When Ang’ Lee‘s BROKEBACK MOUNTAIN burst onto our screens 20 years ago it was a turning point for the advancement of queer cinema into the mainstream.  The film stars Heath Ledger, Jake Gyllenhaal, Anne Hathaway, and Michelle Williams and its plot depicts the complex romantic relationship between two American cowboys, Ennis Del Mar and Jack Twist, in the American West from 1963 to 1983.The…