title: Push custom value to Google Maps marker
body: <p>I want to push a custom var to dynamically loaded Google Maps markers (with live user positions) {via javascript}.  In this case, I want to push a UNIX timestamp into the marker, so that way I can keep track of marker timing.  After a set interval, JS scans for markers timestamps that reach an expired time period -> then remove them.</p>
  
  <p>I wanted to see if any one else played with this similar idea.</p>