RF - cleaned up seeds_from_mask and added affine argument
RF - cleaned up seeds_from_mask and added affine argument

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