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/Adapters/Analytics/AnalyticsAdapter.js

@@ -1,8 +1,18 @@
 export class AnalyticsAdapter {
+  
+  /*
+  @param parameters: the analytics request body, analytics info will be in the dimensions property
+  @param req: the original http request
+   */
   appOpened(parameters, req) {
     return Promise.resolve({});
   }
-
+  
+  /*
+  @param eventName: the name of the custom eventName
+  @param parameters: the analytics request body, analytics info will be in the dimensions property
+  @param req: the original http request
+   */
   trackEvent(eventName, parameters, req) {
     return Promise.resolve({});
   }