title: Insert "Last Modified" timestamp into javadoc footer
body: <p>Is there a way to specify the last modified date of the class file? I'd like each javadoc page to have the last modified timestamp of the class file included, preferrably in the footer.</p>
  
  <p>I thought I had done something like this some time ago, but can't find any examples on the web, and the documentation for footer simply indicates that it can contain html. So can it not have any kind of place holder that will be set when the javadoc is generated?</p>
  
  <p>Thanks.</p>