Visualizing rstan fit with R Shiny

@stan_beginer There’s a big update to shinystan coming that will provide this feature (generating R markdown document from shinystan).

@ducoveen is report generation currently functional on the GitHub branch for version 3? If it is, then @stan_beginer you can try it out with

devtools::install_github("stan-dev/shinystan", ref = "v3-alpha")