Installing missing python-tk in Travis bot
Installing missing python-tk in Travis bot

nilgoyyou/dipy,FrancoisRheaultUS/dipy,JohnGriffiths/dipy,nilgoyyou/dipy,StongeEtienne/dipy,villalonreina/dipy,FrancoisRheaultUS/dipy,StongeEtienne/dipy,matthieudumont/dipy,JohnGriffiths/dipy,matthieudumont/dipy,villalonreina/dipy