faux 1.2.1

• rmulti() function for multivariate distributions that aren't all normal (experimental)
• Minor changes to add_random()
• Fixed minor vignette bugs for CRAN
• Various minor bug fixes
• add_between() and add_within() don't convert non-character levels to factors any more
• submitting to CRAN (sorry for letting it get archived!)
• Fixed the long argument for sim_df()
• Improvements for rmulti() and associated helper functions convert_r() and fh_bounds().
• A vignette for NORTA
• Likert distribution functions rlikert(), dlikert(), plikert() and qlikert()
• add_random() now names random factor items with the full random factor name (e.g., "class1", not "c1")
• add_random() allows you to set specific factor item names (see vignette)