fixed unnecessary warnings when using periodic kernels
fixed unnecessary warnings when using periodic kernels

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