Adding ipython requirements (temporary) and removing unnecessary mock requirement
Adding ipython requirements (temporary) and removing unnecessary mock requirement

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