code: function formatUserAgent(userAgent) {
  	var formattedUserAgent = userAgent.toLowerCase();
  
  	// Strip the version number from robot/1.0 user agents
  	var idx = formattedUserAgent.indexOf('/');
  	if (idx > -1) {
  		formattedUserAgent = formattedUserAgent.substr(0, idx);
  	}
  
  	return formattedUserAgent.trim();
  }
docs: Normalises the user-agent string by converting it to
  lower case and removing any version numbers.
  
  @param  {string} userAgent
  @return {string}
  @private