Jason McCool and Kate Debelack star in “Riding the Bull” Things weren’t going so well for GL Mitchell, the hero of August Schulenburg’s sharp, exceedingly odd and genuinely funny play, Riding the Bull, currently being presented by the Riot Actors of Washington as part of the Capital Fringe Festival. The unlikeliest of rodeo clowns, GL’s a simple Catholic boy living in a small town in Texas who just wants his poor, crazy, Elvis-loving mother…