Switch to internal Google Analytic temple to support v4.

assets/js/tracking.js

@@ -26,7 +26,3 @@ if (cookieConsent) {
     window['ga-disable-' + googleAnalytics] = true;
   }
 }
-
-var _gaq = window._gaq || [];
-_gaq.push(['_setAccount', googleAnalytics]);
-_gaq.push(['_trackPageView']);

layouts/partials/tracking.html

@@ -11,5 +11,5 @@
 {{ if .Site.GoogleAnalytics -}}
 {{ $script := resources.Get "js/tracking.js" | resources.ExecuteAsTemplate "js/tracking.js" . | minify | fingerprint -}}
 <script src="{{ $script.RelPermalink }}"></script>
-<script defer src="https://ssl.google-analytics.com/ga.js"></script>
+{{ template "_internal/google_analytics.html" . }}
 {{ end -}}