WIP: Beginning implementation of the Jacobian.
WIP: Beginning implementation of the Jacobian.

THIS DOES NOT WORK YET. STILL NEED TO THINK ABOUT IT.

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