Fix strange syntax error with Ruby 1.8.7.

    def parse(contents, filename="", options={})

      @doc_ast.filename = filename

      parse_js_or_css(contents, filename, options)

        .map {|docset| expand(docset) }

        .flatten

        .map {|docset| merge(docset) }

      parse_js_or_css(contents, filename, options).map do |docset|

        expand(docset)

      end.flatten.map do |docset|

        merge(docset)

      end

    end

    private