Views for Ash models.

GET /realtime/api/v1/ash/
HTTP 200 OKContent-Type:application/jsonVary:AcceptAllow:GET, POST, HEAD, OPTIONS{
    "count": 1,
    "next": null,
    "previous": null,
    "results": [
        {
            "url": "https://realtime.inasafe.org/realtime/api/v1/ash/Sinabung/20180219085400+0700/",
            "id": 2,
            "volcano": {
                "volcano_name": "Sinabung",
                "elevation": 2460,
                "morphology": "Stratovolcano",
                "region": "Indonesia",
                "location": {
                    "type": "Point",
                    "coordinates": [
                        98.39,
                        3.17
                    ]
                },
                "subregion": "Sumatra",
                "province": "Sumatera Utara",
                "district": "Karo"
            },
            "hazard_file": "https://realtime.inasafe.org/media/ash/hazard_file/2018/02/21/2018021908540700_Sinabung-hazard.tif",
            "impact_files": "https://realtime.inasafe.org/media/ash/impact_files/2018/02/21/201802190854000700-Sinabung-impact.zip",
            "reports": [
                {
                    "url": "https://realtime.inasafe.org/realtime/api/v1/ash-report/Sinabung/20180219085400+0700/id/",
                    "ash_url": "https://realtime.inasafe.org/realtime/api/v1/ash/Sinabung/20180219085400+0700/",
                    "id": 3,
                    "ash": 2,
                    "language": "id",
                    "report_map": "https://realtime.inasafe.org/media/reports/ash/pdf/report_seLDVVr.pdf",
                    "report_map_filename": "201802190854+0700_Sinabung-id.pdf",
                    "report_map_url": "/realtime/ash/report-map/Sinabung/20180219085400+0700/id/"
                },
                {
                    "url": "https://realtime.inasafe.org/realtime/api/v1/ash-report/Sinabung/20180219085400+0700/en/",
                    "ash_url": "https://realtime.inasafe.org/realtime/api/v1/ash/Sinabung/20180219085400+0700/",
                    "id": 4,
                    "ash": 2,
                    "language": "en",
                    "report_map": "https://realtime.inasafe.org/media/reports/ash/pdf/report_vVMwslu.pdf",
                    "report_map_filename": "201802190854+0700_Sinabung-en.pdf",
                    "report_map_url": "/realtime/ash/report-map/Sinabung/20180219085400+0700/en/"
                }
            ],
            "event_time": "2018-02-19T08:54:00+07:00",
            "task_status": "SUCCESS",
            "eruption_height": 5000,
            "hazard_path": null
        }
    ]
}