Update parse SDK to 2.0.0 (#4925)

* WIP: Integrate JS SDK v2

- Removes backbone style callbacks
- Use Promise instead of Parse.Promise

* Fixes ParseObject and ParseRelation

* Updates Parse.Query with promises

* Alls tests should pass

* Ensure a fresh user is used for each test

* Use REST implementation to avoid side effects for username/email duplicates

* Uses js sdk v2

spec/FilesController.spec.js

@@ -6,7 +6,7 @@ const FilesController = require('../lib/Controllers/FilesController').default;
 
 const mockAdapter = {
   createFile: () => {
-    return Parse.Promise.reject(new Error('it failed'));
+    return Promise.reject(new Error('it failed'));
   },
   deleteFile: () => { },
   getFileData: () => { },
@@ -46,9 +46,10 @@ describe("FilesController", () => {
       .then(() => new Parse.File("yolo.txt", [1, 2, 3], "text/plain").save())
       .then(
         () => done.fail('should not succeed'),
-        () => setImmediate(() => Parse.Promise.as('done'))
+        () => setImmediate(() => Promise.resolve('done'))
       )
-      .then(() => logController.getLogs({ from: Date.now() - 500, size: 1000 }))
+      .then(() => new Promise(resolve => setTimeout(resolve, 200)))
+      .then(() => logController.getLogs({ from: Date.now() - 1000, size: 1000 }))
       .then((logs) => {
         // we get two logs here: 1. the source of the failure to save the file
         // and 2 the message that will be sent back to the client.