docs/_plugins/info.rb

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# to you under the Apache License, Version 2.0 (the
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#
# http://www.apache.org/licenses/LICENSE-2.0
#
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module Jekyll
  class InfoTag < Liquid::Tag

    def initialize(tag_name, text, tokens)
      super
      @text = text
    end

    def render(context)
    	if @text.to_s == ''
    		@text = "Info"
    	end

    	@text = @text.strip! || @text if !@text.nil?
    	"<span class=\"label label-info\">#{@text}</span>"
    end
  end
end

Liquid::Template.register_tag('info', Jekyll::InfoTag)