Add LD_PRELOAD to travis
Add LD_PRELOAD to travis

RBigData/pbdMPI,snoweye/pbdMPI,snoweye/pbdMPI,wrathematics/pbdMPI,wrathematics/pbdMPI,snoweye/pbdMPI,wrathematics/pbdMPI,RBigData/pbdMPI,RBigData/pbdMPI,wrathematics/pbdMPI