tidied up some commented code from sparse_GP_regression
tidied up some commented code from sparse_GP_regression

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