Mobile Config Phase 2

gistfile1.txt

Currently:

- S3 bucket proxy_pass

Plan A:

- Serve mobile config route from svc-discovery
- Continue to store 'main' state file in S3
- Add an 'index' state file which looks something like:

```
{
  "ios": {
    "main": "mainconfig.json",
    "custom": [
      { "from": "0", "to": "2559", "file": "forceupgrade_ios.json" }
    ]
  },
  "android": {
    "main": "mainconfig.json",
    "custom": [
      { "from": "0.0.0", "to": "2.1.0", "file": "forceupgrade_android.json" }
    ]
  }
}
```

The resulting json is the merge of both the mainconfig and anything matching the