fix the bug due to changes in Numpy (#744)
fix the bug due to changes in Numpy (#744)


SheffieldML/GPy,esiivola/GPYgradients,SheffieldML/GPy,esiivola/GPYgradients,SheffieldML/GPy,SheffieldML/GPy,esiivola/GPYgradients,esiivola/GPYgradients