http://qiita.com/shu_0115/items/b490bd3de6bc4d5e43a5 http://railsdoc.com/active_supporthttp://qiita.com/joker1007/items/2c277cca5bd50e4cce5e

http://mukaer.com/archives/2013/06/03/rubymarkdownred/ http://d.hatena.ne.jp/kasei_san/20130713/p1 http://qiita.com/ka_/items/ac3082890bf90a6df0c5 http://www.jpfleury.net/en/software/gedit-markdown.php