title: Show count of all google map markers
body: <p>Is there any easy way using the api to get a count of all markers on a map?
  I have a page similar to this <a href="http://www.gorissen.info/Pierre/maps/googleMapLocationv3.php" rel="nofollow noreferrer">http://www.gorissen.info/Pierre/maps/googleMapLocationv3.php</a> where a user can add markers by clicking on the map. I'd also like to show a count of all the markers. I could do this by declaring a global count var and incrementing it in the event listener, but I thought it would be better if there was an API method I could use and I can find it in the docs.</p>