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/Schema.spec.js

@@ -750,7 +750,7 @@ describe('SchemaController', () => {
     hasAllPODobject().save()
       .then(() => config.database.loadSchema())
       .then(schema => schema.deleteField('missingField', 'HasAllPOD'))
-      .fail(error => {
+      .catch(error => {
         expect(error.code).toEqual(255);
         expect(error.message).toEqual('Field missingField does not exist, cannot delete.');
         done();