= ActiveRecord Memoize Class Methods

Author:: Joel Parker Henderson, joelparkerhenderson@gmail.com
Copyright:: Copyright (c) 2009 Joel Parker Henderson
License:: CreativeCommons License, Non-commercial Share Alike
License:: LGPL, GNU Lesser General Public License

ActiveRecord extenstions: ActiveSupport::Memoizable for class methods.

See http://www.railway.at/articles/2008/09/20/a-guide-to-memoization