CC-2438: Add a button to listen to the stream immediately

-but is now available. Need to ask Vladimir to position it under the "On-Air"

airtime_mvc/application/views/scripts/partialviews/header.phtml

@@ -30,6 +30,9 @@
       <li class="time-zone"><span id="time-zone"></span></li>
     </ul>
   </div>
+    <div class="listen-control-block"> 
+        <a class="" href="#"><span>Listen</span></a> 
+    </div> 
   <?php if($this->is_trial){?>
   <div class="trial-info-block">
     <ul>