v4.1

1. Update the vignette. 
2. Update the contact address.

v4.0

1. Add the simulate_error function for simulating errors following any of the 15 mixture normal densities studied in Marron and Wand (1992)

v3.0

1. Update the prediction intervals in bayMCMC_np_global, bayMCMC_np_local, bayMCMC_semi_global, bayMCMC_semi_local
2. Add the loglikelihood, logprior and logdensity as outputs in all four functions
3. Add the loglikelihood_global_admkr and loglikelihood_local_admkr functions

v2.0

1. Update the vignette
2. Change the the range of grid points for the error density to make sure that the cdf is from 0 to 1
3. Add SIF function to check the convergence of the MCMC
4. Add admkr.den, admkr.cdf, admkr.denadj, admkr.cdfadj functions for computing kernel-form error density
5. Add logpriorh2 function for computing prior density of squared bandwidths
6. Add logdensity_admkr, logpriors_admkr, loglikelihood_admkr functions for computing log marginal likelihood
