Restore tag accidentally deleted in 7026c59

Author: pixeltrix

app/views/layouts/application.html.erb

@@ -11,6 +11,14 @@
 
       <!--[if lt IE 9]><%= javascript_include_tag 'ie.js' %><![endif]-->
 
+      <!-- Google Tag Manager -->
+      <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push({'gtm.start':
+      new Date().getTime(),event:'gtm.js'});var f=d.getElementsByTagName(s)[0],
+      j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src=
+      'https://www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);
+      })(window,document,'script','dataLayer','GTM-MQJ6XZ5');</script>
+      <!-- End Google Tag Manager -->
+
       <meta name="viewport" content="width = device-width" />
       <%= render 'application/os' %>
       <%= render 'application/social_meta' %>