Better handling of fatal parse errors.

    # Parses the file depending on filename as JS or CSS

    def parse

      begin

        if @filename =~ /\.s?css$/

          CssParser.new(@contents, @options).parse

        else

          JsParser.new(@contents, @options).parse

        end

      rescue

        puts "Error while parsing #{@filename}: #{$!}"

        puts

        puts "Here's a full backtrace:"

        puts $!.backtrace

        exit(1)

      end

    end

    # Creates two-way link between sourcefile and doc-object.