Another appveyor bug fix
Another appveyor bug fix

dhhjx880713/GPy,befelix/GPy,ysekky/GPy,esiivola/GPYgradients,ysekky/GPy,befelix/GPy,ysekky/GPy,SheffieldML/GPy,ysekky/GPy,mikecroucher/GPy,SheffieldML/GPy,dhhjx880713/GPy,befelix/GPy,dhhjx880713/GPy,dhhjx880713/GPy,mikecroucher/GPy,esiivola/GPYgradients,mikecroucher/GPy,SheffieldML/GPy,SheffieldML/GPy,mikecroucher/GPy,esiivola/GPYgradients,esiivola/GPYgradients,befelix/GPy