Allow GPS Tracker data to be posted directly to miami-transit-api

[qtrandev]

The data at
https://miami-transit-api.herokuapp.com/tracker.json
currently comes through Matt's PHP server. We should have the GPS Tracker post directly to our server.

The data format is:

{
  "type": "FeatureCollection",
  "features": [
    {
      "type": "Feature",
      "geometry": {
        "type": "Point",
        "coordinates": [
          "25.8011",
          "-80.2022"
        ]
      },
      "properties": {
        "lat": "25.8011",
        "lon": "-80.2022",
        "bustime": "2015-06-06 18:15:59",
        "speed": "0.32",
        "BusID": "1"
      }
    }
  ]
}