TST: Make Travis provide verbose test outputs.
TST: Make Travis provide verbose test outputs.

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