Only load GA in production environment

Loads Google Analytics when `WP_ENV` is 'production'
Otherwise it passes `ga()` arguments as an array to `console.log()`

Also sets cookie domain to be auto configured.

lib/scripts.php

@@ -79,15 +79,23 @@ function roots_jquery_local_fallback($src, $handle = null) {
 
 /**
  * Google Analytics snippet from HTML5 Boilerplate
+ * 
+ * Cookie domain is 'auto' configured. See: http://goo.gl/VUCHKM
  */
 function roots_google_analytics() { ?>
 <script>
-  (function(b,o,i,l,e,r){b.GoogleAnalyticsObject=l;b[l]||(b[l]=
-  function(){(b[l].q=b[l].q||[]).push(arguments)});b[l].l=+new Date;
-  e=o.createElement(i);r=o.getElementsByTagName(i)[0];
-  e.src='//www.google-analytics.com/analytics.js';
-  r.parentNode.insertBefore(e,r)}(window,document,'script','ga'));
-  ga('create','<?php echo GOOGLE_ANALYTICS_ID; ?>');ga('send','pageview');
+  <?php if(WP_ENV==='production') :?>
+    (function(b,o,i,l,e,r){b.GoogleAnalyticsObject=l;b[l]||(b[l]=
+    function(){(b[l].q=b[l].q||[]).push(arguments)});b[l].l=+new Date;
+    e=o.createElement(i);r=o.getElementsByTagName(i)[0];
+    e.src='//www.google-analytics.com/analytics.js';
+    r.parentNode.insertBefore(e,r)}(window,document,'script','ga'));
+  <?php else: ?>
+    function ga() {
+      console.log("GoogleAnalytics: " + [].slice.call(arguments));
+    }
+  <?php endif; ?>
+  ga('create','<?php echo GOOGLE_ANALYTICS_ID; ?>','auto');ga('send','pageview');
 </script>
 
 <?php }