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/.eslintrc.json

@@ -20,9 +20,7 @@
       "describe_only": true,
       "on_db": true,
       "defaultConfiguration": true,
-      "expectSuccess": true,
       "range": true,
-      "expectError": true,
       "jequal": true,
       "create": true,
       "arrayContains": true