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/cloud-code/Parse.Cloud.js

@@ -41,11 +41,6 @@ ParseCloud.afterDelete = function(parseClass, handler) {
   triggers.addTrigger(triggers.Types.afterDelete, className, handler, Parse.applicationId);
 };
 
-ParseCloud._removeHook = function(category, name, type, applicationId) {
-  applicationId = applicationId || Parse.applicationId;
-  triggers._unregister(applicationId, category, name, type);
-};
-
 ParseCloud._removeAllHooks = () => {
   triggers._unregisterAll();
 }