title: methods created by attr_accessor are not available to sub classes
body: <p><a href="http://gist.github.com/172341" rel="nofollow noreferrer">http://gist.github.com/172341</a> ( stackoverflow was breaking the formatting )</p>
  
  <p>In the following case method name created by Human is not available to Boy. Is my understanding correct that attr_accessor methods are not 
  available to subclasses. I need to use superclass to access the method added by attr_accessor.</p>