also use string search for back and neck joint costs
also use string search for back and neck joint costs

this is to support the valkyrie neck joints.  in the future, config
files should specify joint groups and costs, nothing should be
hard coded in this file.

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