A bit of additional whitespace to TagRegistry.

    def instantiate_tags(tag_classes)

      tag_classes.each do |cls|

        tag = cls.new()

        Array(tag.pattern).each do |pattern|

          @patterns[pattern] = tag

        end

        Array(tag.ext_define_pattern).each do |pattern|

          @ext_define_patterns[pattern] = tag

        end

        if tag.ext_define_default

          @ext_define_defaults.merge!(tag.ext_define_default)

        end

        if tag.key

          @keys[tag.key] = tag

        end

        Array(tag.merge_context).each do |context|

          @mergers[context] = [] unless @mergers[context]

          @mergers[context] << tag

        end

        if tag.member_type

          @member_types << tag.member_type

        end

        if tag.signature

          tag.signature[:key] = tag.key

          @signatures << tag.signature

        end

        if tag.html_position

          @html_renderers << tag

        end