v0.4.1

Move to usage of CRAN portalr

• To aid with stability, we're now using the CRAN release of portalr

model_scripts function

• Provides a simple way to list the scripts in the models subdirectory.

Including the package version message in setup_dir and portalcast

• Including a simple message to report the version of portalcasting
  loaded in top level functions.

Vignette updates

• Adding plot (from pre-constructed images) to the how-to vignette.

Patching a bug in model_template

• There was a lingering old name from the argument switch over that was
  causing model templates to be written with a "" argument for the model
  model name input into save_forecast_output.