Add Piwik tracking code

.env.example

@@ -50,3 +50,5 @@ TWITTER_ACCESS_TOKEN=
 TWITTER_ACCESS_TOKEN_SECRET=
 
 SCOUT_DRIVER=pgsql
+
+PIWIK=false

config/app.php

@@ -271,4 +271,6 @@ return [
 
     ],
 
+    'piwik' => env('PIWIK', false),
+
 ];

resources/views/master.blade.php

@@ -45,5 +45,22 @@
     <p>Built with love: <a href="/colophon">Colophon</a></p>
     <p><a href="https://indieweb.org"><img src="/assets/img/iwc.png" alt="Indie Web Camp logo" class="iwc-logo"></a></p>
 </footer>
+@if (config('app.piwik') === true)
+<!-- 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="https://analytics.jmb.lv/";
+        _paq.push(['setTrackerUrl', u+'piwik.php']);
+        _paq.push(['setSiteId', '1']);
+        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 -->
+@endif
 </body>
 </html>