http://techlife.cookpad.com/entry/how-to-safely-upgrade-rails
Wed Mar 30 2016 02:39:56 GMT+0900 (JST)
https://speakerdeck.com/masatokinugawa/shibuya-dot-xss-techtalk-number-7
Wed Mar 30 2016 02:38:11 GMT+0900 (JST)
http://qiita.com/Kaki_Shoichi/items/56f82bbfe244ab022b7d
Wed Mar 30 2016 02:36:57 GMT+0900 (JST)
http://hitoriblog.com/?p=38724
Wed Mar 30 2016 02:35:51 GMT+0900 (JST)