Reverts calling next() after handling response (#2634)

* Revert "Makes sure routes don't overlap and yield a header set error"

* removes next() calls in PromiseRouter

* Reverts calling next() after response

* Adds fail calls when next() calls traverse tests

src/Routers/AnalyticsRouter.js

@@ -1,6 +1,11 @@
 // AnalyticsRouter.js
 import PromiseRouter from '../PromiseRouter';
 
+function appOpened(req) {
+  const analyticsController = req.config.analyticsController;
+  return analyticsController.appOpened(req);
+}
+
 function trackEvent(req) {
   const analyticsController = req.config.analyticsController;
   return analyticsController.trackEvent(req);
@@ -9,6 +14,7 @@ function trackEvent(req) {
 
 export class AnalyticsRouter extends PromiseRouter {
   mountRoutes() {
+    this.route('POST','/events/AppOpened', appOpened);
     this.route('POST','/events/:eventName', trackEvent);
   }
 }