def get_nokogiri(path)
    uri = URI.join('https://stellar.mit.edu', path)
    raw_html = @mech.get_file uri
    Nokogiri.HTML raw_html, uri.to_s
  end
def get_nokogiri(path)
    uri = URI.join('https://stellar.mit.edu', path)
    raw_html = @mech.get_file uri
    Nokogiri.HTML raw_html, uri.to_s
  end
Fetches a page from the Stellar site.

 @param [String] path relative URL of the page to be fetched
 @return [Nokogiri::HTML::Document] the desired page, parsed with Nokogiri