TEST: Adding test for periodic kernel
TEST: Adding test for periodic kernel

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