Add config.json support for forkName and forkedDataUrl

[ryanstreur]

example:

{
  "nashville": {
    "url": "{url}",
    "dataLocationUrl": "{url}"
  }
}

Incorrect - see Aditya's comment below

[goreaditya]

{
  "nashville": {
   [
     "RSGInc":{ "url": "{url}",
       "dataLocationUrl": "{url}"},
     "Fork":{ "url": "{forkurl}",
       "dataLocationUrl": "{forkurl}"}
  ]
  }
}