http://www.cnblogs.com/abbuggy/archive/2012/12/09/2809964.html
http://blog.csdn.net/dazhi_100/article/details/38986409
http://blog.csdn.net/abbuggy/article/details/8275485
Rails 中的类加载机制
https://ruby-china.org/topics/26034
26 - Hackers Love Mass Assignment
http://blog.csdn.net/dazhi_100/article/details/39011617
53 - Handling Exceptions
#111 Advanced Search Form
#117 Semi-Static Pages
#162 Tree-Based Navigation
#209 Devise
#271 Resque
#284 Active Admin
#332 Refinery Cms Basics
#334 Compass & Css Sprites
