def scanner
      @scanner ||= Scanner.new(
        @doc.root['scanner'],
        @doc.root['version'],
        @doc.root['args'],
        Time.at(@doc.root['start'].to_i)
      )
    end
def scanner
      @scanner ||= Scanner.new(
        @doc.root['scanner'],
        @doc.root['version'],
        @doc.root['args'],
        Time.at(@doc.root['start'].to_i)
      )
    end
Parses the scanner information.

 @return [Scanner]
   The scanner that was used and generated the scan file.