PEP8 fixes
PEP8 fixes

Messaoud-Boudjada/dipy,samuelstjean/dipy,samuelstjean/dipy,StongeEtienne/dipy,samuelstjean/dipy,sinkpoint/dipy,rfdougherty/dipy,sinkpoint/dipy,demianw/dipy,JohnGriffiths/dipy,villalonreina/dipy,jyeatman/dipy,Messaoud-Boudjada/dipy,villalonreina/dipy,beni55/dipy,mdesco/dipy,oesteban/dipy,oesteban/dipy,mdesco/dipy,JohnGriffiths/dipy,nilgoyyou/dipy,jyeatman/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,demianw/dipy,rfdougherty/dipy,beni55/dipy,matthieudumont/dipy,FrancoisRheaultUS/dipy,nilgoyyou/dipy,StongeEtienne/dipy