code: function loadJSON (file, callback) {
    loadText(file, function (err, data) {
      if (err) {
        callback(err, null)
      } else {
        var json = null
        try {
          json = JSON.parse(data)
        } catch (e) {
          return callback(e, null)
        }
        callback(null, json)
      }
    })
  }
docs: Loads JSON data
  @param {String} file - url addess (Browser) or file path (Plask)
  @param {Function} callback - function(err, json) { }
  @param {Error} callback.err - error if any or null
  @param {String} callback.json - loaded JSON data