sintaxi/terraform: Alternatively accept `_data.js` for metadata instead of plain JSON

_data.js

// simplest example
module.exports = {
  "some-page": {
    "title": "This uses data from an external JSON file",
    "sourceData": require("./some.json")
  }
};

raw.js#L222

  try{
    var possibleNames = ["_data.json", "_data.js"]
    var dataPath
    for(var i = 0; i < possibleNames.length; i++){
      dataPath = path.resolve(dirPath, possibleNames[i])
      if(fs.existsSync(dataPath)){
        // ensure reload
        delete require.cache[dataPath]
        obj.data = require(dataPath)
        break
      }
    }
  }catch(e){
    // removed check for non-existing case, this is explicitly taken care of above
    e.source    = "Data"
    e.dest      = "Globals"
    e.lineno    = -1
    e.filename  = dataPath
    //e.stack     = fileData.toString()
    throw new TerraformError(e)
    //console.log(e.code)
  }

This applies to https://github.com/sintaxi/terraform/blob/master/lib/helpers/raw.js#L222
See sintaxi/harp#103 for original context.