added unittests for sparse gp with uncertain inputs
added unittests for sparse gp with uncertain inputs

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