Added SRC_DIR path constant.
Added SRC_DIR path constant.

NASA-Tensegrity-Robotics-Toolkit/NTRTsim,MRNAS/NTRT,dacastro12/NTRT_Update,dacastro12/NTRT_Update,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,MRNAS/NTRT,MRNAS/NTRT,meshula/NTRTsim,UnionEvoRobo/NTRTsim,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,dacastro12/NTRT_Update,dacastro12/NTRT_Update,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,MRNAS/NTRT,meshula/NTRTsim,dacastro12/NTRT_Update,NASA-Tensegrity-Robotics-Toolkit/NTRTsim,MRNAS/NTRT,MRNAS/NTRT,UnionEvoRobo/NTRTsim,UnionEvoRobo/NTRTsim,UnionEvoRobo/NTRTsim,meshula/NTRTsim,meshula/NTRTsim