code: @Override
      public void include(InputStream is, String source) throws IOException
      {
          include(is, Charset.defaultCharset(), source);
      }
docs: Include InputStream at current input. InputStream is read as part of
  input. When InputStream ends, input continues using current input.
  
  <p>Included stream is closed at eof
  
  @param is Incuded input
  @param source Description of the source
  @throws IOException