Refactor templates and rearrange its path

public/views/shared/ga.ejs

@@ -0,0 +1,18 @@
+<% if(typeof GA !== 'undefined' && GA) { %>
+<script>
+(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');
+
+ga('create', '<%= GA %>', 'auto');
+ga('send', 'pageview');
+</script>
+<% } %>