don't throw exception on property block (with special character) on geojson

Related Issue: #73

Resolves issue where Indexer service fails to parse the GeoJson shape if one the value has special character e.g. : (colon). Here is the sample, for which it fails

{
  "Wgs84Coordinates": {
    "features": [
      {
        "geometry": {
          "type": "Point",
          "coordinates": [
            2.2863,
            61.198685
          ]
        },
        "properties": {
          "id": "a:b"
        },
        "type": "Feature"
      }
    ],
    "type": "FeatureCollection"
  }
}