Add piwik tracking code

docs/extras/javascript/piwik.js

@@ -0,0 +1,15 @@
+<!-- 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.funkypenguin.co.nz/";
+    _paq.push(['setTrackerUrl', u+'piwik.php']);
+    _paq.push(['setSiteId', '2']);
+    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 -->

mkdocs.yml

@@ -75,6 +75,9 @@ extra:
 #  - 'UA-XXXXXXXX-X'
 #  - 'auto'
 
+extra_javascript:
+  - 'extras/javascript/piwik.js'
+
 # Extensions
 markdown_extensions:
   - admonition