Corrected ga code according to new eu law

Author: mxklb

js/ga.js

@@ -1,7 +1,18 @@
-  (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
-  (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
+var gaProperty = 'UA-64951930-1';
+var disableStr = 'ga-disable-' + gaProperty;
+if (document.cookie.indexOf(disableStr + '=true') > -1) {
+  window[disableStr] = true;
+}
+function gaOptout() {
+  document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/';
+  window[disableStr] = true;
+  alert('Das Tracking ist jetzt deaktiviert');
+}
+(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+ (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
   m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-  })(window,document,'script','//www.google-analytics.com/analytics.js','ga');
+})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
 
-  ga('create', 'UA-64951930-1', 'auto');
-  ga('send', 'pageview');
+ga('create', 'UA-64951930-1', 'auto');
+ga('set', 'anonymizeIp', true);
+ga('send', 'pageview');