Delete a Deadline.
The underlying data model where the item is deleted from is defined in devilry.apps.core.models.Deadline. The Simplified API that the server forwards this request to is devilry.apps.examiner.simplified.SimplifiedDeadline.delete().
As long as the Deadline is deleted without an error, the response is HTTP 200 with a JSON object containing the id in the response body.
200 OK
{
id: 10
}
On errors, we respond with one of the HTTP Error status codes