Added updatedDate and createdDate to model
Added updated_at and created_at to JSON
Update pods

- NSManagedObject-ANDYMapChanges 0.4 (was 0.4)
- NSManagedObject-HYPPropertyMapper 2.1 (was 2.0)
Test updatedDate and createdDate
Merge pull request #6 from NSElvis/feature/update-with-date-mapping

Feature/update with date mapping