title: Can't get overview.html into javadoc with gradle
body: <p>Using the latest gradle, I am trying to get the standard overview.html to appear in the javadocs for my project.  I have tried several different methods of configuration with no luck.  Here's the latest:</p>
  
  <p><code>javadoc.ext["overview"] = "${projectDir}/src/main/java/overview.html"</code></p>
  
  <p>No errors are reported, however, the overview blurb does not appear in the javadocs index page.  I <strong>can</strong> get this to work invoking javadoc from the command line or an IDE.</p>
  
  <p>Thanks for helping.  (I <strong>have</strong> checked the <a href="http://www.gradle.org/docs/current/javadoc/org/gradle/external/javadoc/package-summary.html" rel="noreferrer">gradle docs</a>.)</p>