docs: Use my own piwik instead of google analytics

Author: philpep

doc/source/_templates/layout.html

@@ -0,0 +1,17 @@
+{% extends "!layout.html" %}
+{%- block footer %}
+{{ super() }}
+<script type="text/javascript">
+  var _paq = _paq || [];
+  _paq.push(['trackPageView']);
+  _paq.push(['enableLinkTracking']);
+  (function() {
+    var u="//stats.philpep.org/piwik/";
+    _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>
+<noscript><p><img src="//stats.philpep.org/piwik/piwik.php?idsite=2" style="border:0;" alt="" /></p></noscript>
+{% endblock %}

doc/source/conf.py

@@ -115,7 +115,6 @@
     'github_repo': 'testinfra',
     'github_button': True,
     'travis_button': True,
-    'analytics_id': 'UA-63638452-1',
     'extra_nav_links': {
         'View on github': 'https://github.com/philpep/testinfra',
     },