code: function logAtLevel_(message, level) {
    if (message != null) {
      var messageDiv = $('<div></div>');
      messageDiv.addClass(level);
      if (typeof message === 'object') {
        messageDiv.text(JSON.stringify(message, null, '  '));
      } else {
        messageDiv.text(message);
      }
      $('.logs').append(messageDiv);
    }
    console[level](message);
  }
docs: Logs the message in the console and on the log window in the app
  using the level given.
  @param {?Object} message Object or message to log.
  @param {string} level The level of log (log, error, debug).
  @private