title: plugin-info.html not being generated for Maven site
body: <p>I have a custom Maven plugin for which I want to generate a site. The sole purpose of this site is to automatically document the plugin's available goals. However, when I execute <code>mvn clean site</code>, the <code>plugin-info.html</code> file is never generated.</p>
  
  <p>Given that the packaging for this module is <code>maven-plugin</code>, I assumed that this would automatically be created by the site plugin. I looked at the site plugin's <a href="http://maven.apache.org/plugins/maven-site-plugin/site-mojo.html" rel="nofollow">goals</a> to see if this had to explicitly be "turn on", but did find anything. Is there something I am missing that will force the plugin-info.html to be created?</p>
  
  <p>I am using:</p>
  
  <ul>
  <li>Maven 3.0.3</li>
  <li>maven-site-plugin 3.0</li>
  </ul>