[Poly] added bias and scale
[Poly] added bias and scale

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