Style improvements (#2475)

* HooksRouter is enabled by default

* Adds middleswares on PromiseRouter, fixes #2410

* Move testing line to helper

* Modernize middlewares.js

* Moves DB uniqueness initialization to DBController, modernize

* Moves testing related code to spec folder

* remove unused _removeHook function

* Adds tests, docs for Analytics and improvements

* nit

* moves back TestUtils

src/Routers/PublicAPIRouter.js

@@ -152,10 +152,10 @@ export class PublicAPIRouter extends PromiseRouter {
       req => { return this.requestResetPassword(req); });
   }
 
-  expressApp() {
-    let router = express();
+  expressRouter() {
+    let router = express.Router();
     router.use("/apps", express.static(public_html));
-    router.use("/", super.expressApp());
+    router.use("/", super.expressRouter());
     return router;
   }
 }