Placing Markdown-parsed HTML inside <div>.

      # Markdown-formatted text.

      unless input =~ /<[a-z]/

        begin

          input = Maruku.new(input, {:on_error => :raise}).to_html

          input = "<div class='markdown'>" + Maruku.new(input, {:on_error => :raise}).to_html + "</div>"

        rescue MaRuKu::Exception

          # When Maruku fails because of Markdown syntax error, assume

          # the author didn't intend to write doc-comment in Markdown