title: Random query strings appearing when including scripts
body: <p>On my website I am having issues with random query strings appearing when I include scripts on my webpage. I know it's not me as both Pingdom &amp; Google Pagespeed have confirmed that I have random query strings, but the issue is why. For example, </p>
  
  <pre><code>&lt;script type="text/javascript" src="js/randomfile.js"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>appears in developer tools of Chrome, Firefox, and IE as</p>
  
  <pre><code>&lt;script type="text/javascript" src="js/randomfile.js?_=1247543709724"&gt;&lt;/script&gt;
  </code></pre>
  
  <p>Any pointers as in why this would be happening? 
  Any help would be appreciated.</p>