PEP8 in test_dti.py
PEP8 in test_dti.py

JohnGriffiths/dipy,villalonreina/dipy,nilgoyyou/dipy,villalonreina/dipy,StongeEtienne/dipy,matthieudumont/dipy,StongeEtienne/dipy,JohnGriffiths/dipy,nilgoyyou/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,FrancoisRheaultUS/dipy