Add reachHeight attr to valveDemo
Add reachHeight attr to valveDemo

Allows us to approach the valve from slightly above its axis

mitdrc/director,manuelli/director,empireryan/director,empireryan/director,RussTedrake/director,gizatt/director,rdeits/director,empireryan/director,RobotLocomotion/director,edowson/director,openhumanoids/director,empireryan/director,manuelli/director,rdeits/director,RussTedrake/director,rdeits/director,mitdrc/director,rdeits/director,gizatt/director,mitdrc/director,RobotLocomotion/director,openhumanoids/director,RussTedrake/director,empireryan/director,RussTedrake/director,RobotLocomotion/director,gizatt/director,openhumanoids/director,mithrandir123/director,rdeits/director,mithrandir123/director,openhumanoids/director,mithrandir123/director,patmarion/director,mithrandir123/director,edowson/director,patmarion/director,patmarion/director,RobotLocomotion/director,patmarion/director,patmarion/director,gizatt/director,edowson/director,openhumanoids/director,edowson/director,manuelli/director,edowson/director,manuelli/director,gizatt/director,mitdrc/director,RobotLocomotion/director,RussTedrake/director,manuelli/director,mithrandir123/director,mitdrc/director