add additional package search paths for ddDrakeModel
add additional package search paths for ddDrakeModel

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