title: Event after all ajax calls are complete
body: <p>I have a click event that fires off 3 ajax calls: </p>
  
  <pre><code>$("#button").click(function(e) {
      e.preventDefault();
  
      $.ajax(call1);
      $.ajax(call2);
      $.ajax(call3);
  
      some_function() //should fire off AFTER all ajax calls are complete
  });
  </code></pre>
  
  <p>Is there a way for me to confirm all ajax calls have been fired BEFORE firing off my <code>some_function()</code> function?</p>
  
  <p>Thanks in advance!</p>