console.groupCollapsed("Application Log"); - what is it?
This is something Craft only shows if your site is in devMode (http://buildwithcraft.com/help/dev-mode). 

If you use Firebug or Chrome Developer Tools for instance, it shows you a performance and error log.

By disabling devMode, it disappears. Do this by setting 'devMode' => false into your craft/config/general.php.