Add Piwik code for extensions.typo3.org

`

extensions.typo3.org

<!-- Piwik -->
<script type="text/javascript">
 var _paq = _paq || [];
 /* tracker methods like "setCustomDimension" should be called before "trackPageView" */
 _paq.push(['trackPageView']);
 _paq.push(['enableLinkTracking']);
 (function() {
   var u="//piwik.typo3.org/";
   _paq.push(['setTrackerUrl', u+'piwik.php']);
   _paq.push(['setSiteId', '38']);
   var d=document, g=d.createElement('script'), s=d.getElementsByTagName('script')[0];
   g.type='text/javascript'; g.async=true; g.defer=true; g.src=u+'piwik.js'; s.parentNode.insertBefore(g,s);
 })();
</script>
<!-- End Piwik Code -->

`

Option for do not track and Cookie

_paq.push(['setVisitorCookieTimeout', '2592000']);
_paq.push(['setSessionCookieTimeout', '0']);
_paq.push(['setDoNotTrack', true]);