http://pivotallabs.com/users/nick/blog/articles/272-access-control-permissions-in-rails
http://railstips.org/2009/4/20/how-to-add-simple-permissions-into-your-simple-app-also-thoughtbot-rules
http://pivotallabs.com/users/nick/blog/articles/272-access-control-permissions-in-rails
http://railstips.org/2009/4/20/how-to-add-simple-permissions-into-your-simple-app-also-thoughtbot-rules
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