Remove validation testing for notification_type
- notification_type is no longer a validation in the Notification model
Remove validation testing for datetime_sent
- Notification model no longer has datetime_sent attribute
- Remove testing for datetime_sent to have a value upon creation because notifications are sent hours after they are created from nightly cron jobs
Merge pull request #167 from spring-peepers-2014/Notification_Validation_Testing

Update notification validation testing