Return scores list for the application

GET /api/applications/123/scores
Host: apply.example.edu
Authorization: DREAM apikey="..."

Content-Type: application/json
Content-Length: 1456
X-Count: 15

{
    "1": {
        "scored": "2019-03-05T14:57:36+00:00",
        "application": "/api/applications/123",
        "scoresheet": "/api/scoresheets/1",
        "points": "20.00",
        "comments": "One"
    },
    "5": {
        "scored": "2019-03-05T14:57:33+00:00",
        "application": "/api/applications/123",
        "scoresheet": "/api/scoresheets/2",        
        "points": "40.00",
        "comments": "Two"
    }
}