Disable mailchimp integration for most segment identify requests

cms/templates/widgets/segment-io-footer.html

@@ -5,10 +5,21 @@
         // We can't use JQuery's on load method because it
         // screws up RequireJS' JQuery initialization.
         var onLoadCallback = function() {
-            analytics.identify("${user.id}", {
-              email: "${user.email}",
-              username: "${user.username}"
-            });
+            analytics.identify(
+                "${user.id}",
+                {
+                    email: "${user.email}",
+                    username: "${user.username}"
+                },
+                {
+                    integrations: {
+                        // Disable MailChimp because we don't want to update the user's email
+                        // and username in MailChimp on every page load. We only need to capture
+                        // this data on registration/activation.
+                        MailChimp: false
+                    }
+                }
+            );
         };
         if (window.addEventListener) {
             window.addEventListener("load", onLoadCallback, false);