added mks 937 controller
added mks 937 controller

USGSDenverPychron/pychron,UManPychron/pychron,UManPychron/pychron,USGSDenverPychron/pychron,NMGRL/pychron,UManPychron/pychron,UManPychron/pychron,NMGRL/pychron,NMGRL/pychron,NMGRL/pychron,USGSDenverPychron/pychron,USGSDenverPychron/pychron