Removed the save tensor method for fibernav for a fibernav specific example or to be used with dipy.external or dipy.io
Removed the save tensor method for fibernav for a fibernav specific example or to be used with dipy.external or dipy.io

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