code: function labels (modelName, callback) {
  
      if (callback) {
          return get(modelName, true).getLabels(callback);
      }
  
      return get(modelName, true).getLabels();
  
  }
docs: Retrieve the labels for a model
  @param  {String}   modelName The name of the model
  @param  {Function} callback  An optional callback to return the labels object to
  @return {Void}