fixed bug in GP_regression
fixed bug in GP_regression

jameshensman/GPy,PredictiveScienceLab/GPy,dhhjx880713/GPy,Dapid/GPy,dhhjx880713/GPy,SheffieldML/GPy,avehtari/GPy,avehtari/GPy,buntyke/GPy,SheffieldML/GPy,PredictiveScienceLab/GPy,esiivola/GPYgradients,SheffieldML/GPy,jameshensman/GPy,fivejjs/GPy,ptonner/GPy,AlexGrig/GPy,TianpeiLuke/GPy,AlexGrig/GPy,dhhjx880713/GPy,buntyke/GPy,beckdaniel/GPy,maaskola/GPy,fivejjs/GPy,avehtari/GPy,esiivola/GPYgradients,strongh/GPy,mikecroucher/GPy,TianpeiLuke/GPy,befelix/GPy,gusmaogabriels/GPy,befelix/GPy,ptonner/GPy,ptonner/GPy,Dapid/GPy,mikecroucher/GPy,ysekky/GPy,gusmaogabriels/GPy,AlexGrig/GPy,ptonner/GPy,maaskola/GPy,SheffieldML/GPy,buntyke/GPy,AlexGrig/GPy,befelix/GPy,ysekky/GPy,mikecroucher/GPy,beckdaniel/GPy,mikecroucher/GPy,strongh/GPy,jameshensman/GPy,Dapid/GPy,gusmaogabriels/GPy,esiivola/GPYgradients,Dapid/GPy,maaskola/GPy,befelix/GPy,jameshensman/GPy,maaskola/GPy,dhhjx880713/GPy,beckdaniel/GPy,beckdaniel/GPy,ysekky/GPy,avehtari/GPy,PredictiveScienceLab/GPy,buntyke/GPy,fivejjs/GPy,esiivola/GPYgradients,PredictiveScienceLab/GPy,strongh/GPy,TianpeiLuke/GPy,ysekky/GPy