Add youtube api to CMS for video module

cms/templates/base.html

@@ -31,6 +31,10 @@
     <script src="${static.url('js/vendor/jquery.cookie.js')}"></script>
     <script src="${static.url('js/vendor/jquery.leanModal.min.js')}"></script>
     <script src="${static.url('js/vendor/jquery.tablednd.js')}"></script>
+    <script type="text/javascript">
+      document.write('\x3Cscript type="text/javascript" src="' +
+          document.location.protocol + '//www.youtube.com/player_api">\x3C/script>');
+    </script>
 
     <%block name="content"></%block>