code: function setFileOption (file) {
      if (!options.file) {
        options.file = path.join(path.dirname(file), "banner.txt");
      }
    }
docs: If the `file` option isn't set, then it defaults to "banner.txt" in the same directory
  as the first entry file.  We'll crawl up the directory tree from there if necessary.
  
  @param {string} file - The full file path