public static String getAuthor( Path pluginDir )
    {
        return getElementValue( pluginDir, "/plugin/author" );
    }
Returns the author of a plugin. The value is retrieved from the plugin.xml file of the plugin. If the value could
not be found, {@code null} will be returned.

@param pluginDir the path of the plugin directory.
@return the plugin's author.
xmppserver/src/main/java/org/jivesoftware/openfire/container/PluginMetadataHelper.java