RF - few changes to fit_tensor
RF - few changes to fit_tensor

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