[Kern] added assertion for inputs X being matrix (ndim == 2)
[Kern] added assertion for inputs X being matrix (ndim == 2)

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