TODO list for Perl module Games::Jumble

    - Add ability to create custom puzzles by using
      user defined word files.
    - Add functionality so that there is a master clue
      and each jumbled word will contain one or more letters
      that will make up the master clue.
    - Allow user to select number of letters per word.
    - Allow user to select number of master clue letters per word.
    - Move dictionary read to separate method.
    - get_word_lengths_allowed() and get_word_lengths_not_allowed()
      return a hash ref...change to 'private' method intead of autoload?
