(QE-602) Beaker Throws Fatal Error when Displaying Current Version

- this is caused by using git-ls to generate file lists and causes
  failures when the gem is used from a directory that does not have a
  .git directory.  Using a ruby generated file list removes this
  dependency

- tested to ensure that the length of file lists generated was the same from the old git-ls solution to the new ruby Dir solution.  The same files will be listed no matter the tool used.