Refactor sign up analytics

node_modules/c9/format-user-analytics.js

@@ -11,7 +11,7 @@ define(function(require, exports, module) {
         if (!user) return {}; // empty traits get ignored
 
          var traits = {
-                uid: user.anonymousId || user.id,
+                uid: user.uid || user.id,
                 username: user.name || user.username,
                 email: user.email,
                 createdAt: user.date_add,