* 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
* Use the callback body instead of response.body that may not be set
* Adds test to handle undefined responses
* Adds toJSON method to properly serialize HTTPResponse
* Use ES5 defineProperty to make keys enumerable
* removes body key from serialization
* Indent nits
