Install and/or load packages (add to the munge folder in ProjectTemplate)

01-load-packages.R

load_packages <- function(pkgs, repo = "http://ftp.sunet.se/pub/lang/CRAN/"){
    invisible(lapply(pkgs, function(pkg) {
        req <- function(x) require(x, character.only = TRUE)
        if(!suppressWarnings(req(pkg))){
            install.packages(pkg, repos = repo)
            req(pkg)
        }     
    }))
}