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

package.json

@@ -33,7 +33,7 @@
     "lru-cache": "4.1.2",
     "mime": "2.3.1",
     "mongodb": "3.1.1",
-    "parse": "1.11.1",
+    "parse": "2.0.0",
     "pg-promise": "8.4.5",
     "redis": "2.8.0",
     "request": "2.85.0",