include field_configs as config array in setup.json for frontend

'nuff said.  here's a sample 
```
{
  "id": 1,
  "name": "Sample Screen",
  "template": {
    "id": 2,
    "path": "\/frontend\/1\/templates\/2",
    "positions": [
      {
        "bottom": "0.8",
        "id": 5,
        "left": "0.1",
        "right": "0.9",
        "style": "",
        "top": "0.1",
        "field_contents_path": "\/frontend\/1\/fields\/1\/contents.json",
        "field": {
          "id": 1,
          "name": "Graphics",
          "config": [
            {
              "key": "transition",
              "value": "fade",
              "value_type": "string"
            },
            {
              "key": "order",
              "value": "random",
              "value_type": "string"
            }
          ]
        }
      },
      {
        "bottom": "0.98",
        "id": 7,
        "left": "0.5",
        "right": "0.9",
        "style": "",
        "top": "0.8",
        "field_contents_path": "\/frontend\/1\/fields\/2\/contents.json",
        "field": {
          "id": 2,
          "name": "Ticker",
          "config": [
            {
              "key": "scrolling_marquis",
              "value": "true",
              "value_type": "string"
            }
          ]
        }
      }
    ]
  }
}
```