title: verifying a single attendee with email
body: <p>Is there a method to return a specific attendee's information by sending:</p>
  
  <p>1) the attendee's email address</p>
  
  <p>2) my user_key </p>
  
  <p>3) my app_key</p>
  
  <p>I could do this by searching the returned xml from this "event_list_attendees" method, however, I would prefer to only receive the one result (not hundreds for each call).</p>