Process queries for HexGrid objects.
:param request: HTTP GET request
:return: JSON format of HexGrid (only pk and count) or GeoJSON of the geom of HexGrid.

GET /api/occurrence/grid/?taxon=234
HTTP 200 OK
Allow: OPTIONS, GET
Content-Type: application/json
Vary: Accept

{
    "features": [
        {
            "properties": {
                "pk": "441655"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
                        [
                            [
                                -2999997.66874837,
                                1587713.98054329
                            ],
                            [
                                -2916664.29656084,
                                1732051.61513813
                            ],
                            [
                                -2749997.55218579,
                                1732051.61513813
                            ],
                            [
                                -2666664.17999826,
                                1587713.98054329
                            ],
                            [
                                -2749997.55218579,
                                1443376.34594844
                            ],
                            [
                                -2916664.29656084,
                                1443376.34594844
                            ],
                            [
                                -2999997.66874837,
                                1587713.98054329
                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "441765"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
                        [
                            [
                                -2499997.43562321,
                                1587713.98054329
                            ],
                            [
                                -2416664.06343568,
                                1732051.61513813
                            ],
                            [
                                -2249997.31906062,
                                1732051.61513813
                            ],
                            [
                                -2166663.9468731,
                                1587713.98054329
                            ],
                            [
                                -2249997.31906062,
                                1443376.34594844
                            ],
                            [
                                -2416664.06343568,
                                1443376.34594844
                            ],
                            [
                                -2499997.43562321,
                                1587713.98054329
                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442297"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
                        [
                            [
                                3.73000261001289,
                                -3608440.86487111
                            ],
                            [
                                83337.1021901372,
                                -3464103.23027626
                            ],
                            [
                                250003.846565192,
                                -3464103.23027626
                            ],
                            [
                                333337.218752719,
                                -3608440.86487111
                            ],
                            [
                                250003.846565192,
                                -3752778.49946595
                            ],
                            [
                                83337.1021901372,
                                -3752778.49946595
                            ],
                            [
                                3.73000261001289,
                                -3608440.86487111
                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442304"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
                        [
                            [
                                3.73000261001289,
                                -1587713.98054329
                            ],
                            [
                                83337.1021901372,
                                -1443376.34594844
                            ],
                            [
                                250003.846565192,
                                -1443376.34594844
                            ],
                            [
                                333337.218752719,
                                -1587713.98054329
                            ],
                            [
                                250003.846565192,
                                -1732051.61513813
                            ],
                            [
                                83337.1021901372,
                                -1732051.61513813
                            ],
                            [
                                3.73000261001289,
                                -1587713.98054329
                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        },
        {
            "properties": {
                "pk": "442655"
            },
            "type": "Feature",
            "geometry": {
                "coordinates": [
                    [
                        [
                            [
                                1500004.4293781,
                                4474466.67244017
                            ],
                            [
                                1583337.80156563,
                                4618804.30703502
                            ],
                            [
                                1750004.54594068,
                                4618804.30703502
                            ],
                            [
                                1833337.91812821,
                                4474466.67244017
                            ],
                            [
                                1750004.54594068,
                                4330129.03784533
                            ],
                            [
                                1583337.80156563,
                                4330129.03784533
                            ],
                            [
                                1500004.4293781,
                                4474466.67244017
                            ]
                        ]
                    ]
                ],
                "type": "MultiPolygon"
            }
        }
    ],
    "crs": {
        "type": "name",
        "properties": {
            "name": "EPSG:3031"
        }
    },
    "type": "FeatureCollection"
}