RF - Fixed some bugs with FA and ADC in tensor class
RF - Fixed some bugs with FA and ADC in tensor class

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