RF: Don't import all this every time.
RF: Don't import all this every time.

Deals with gh #29

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