code: function isResponseError(response, callback) {
    if(response.error) {
      callback(new Error('Coinjar personal fair_rate api returned error: ' + response.error));
      return true;
    }
    if(!response.body) {
      callback(new Error('Coinjar personal fair_rate api returned error: No response body.'));
      return true;
    }
    return false;
  }
docs: @name isResponseError
  @description Common error facility.
  
  @param {Object} response
  @param {Function} callback
  @returns {boolean} False if `response` has no error and user object.