title: How to override module classes in Kohana 3?
body: <p>In Kohana 3, how can I override/extend a module class? </p>
  
  <p>E.g. I want to add functionality to the Auth module that is specific to my application. In this case I want to extend the abstract Auth class located in the classes folder of the Auth module.</p>
  
  <p>What naming convention should I use for my Auth class and where in the file system do I place my class file?</p>