Do not use 'keepdims' of numpy.mean as it is not available in Numpy 1.6
Do not use 'keepdims' of numpy.mean as it is not available in Numpy 1.6

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