Put the class hierarchy to work

Overriding methods cleanly (not so useful on Ruby 2.0...):

 1   def override_method(*symbols, &block)
 2     new_methods = Module.new
 3     old_methods = Module.new
 4     new_methods.instance_eval { include old_methods }
 5     include new_methods
 6 
 7     symbols.each do |symbol|
 8       old_methods.__send__(:define_method, symbol, instance_method(symbol))
 9       new_methods.module_eval(&block)
10       define_method(symbol, new_methods.instance_method(symbol))
11     end
12   end