RF - Fixed a few bugs with Tensor class in dti.py ... renamed modules to fit convention
RF - Fixed a few bugs with Tensor class in dti.py ... renamed modules to fit convention

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