[CORE][COMPOSER] Move extlib packages with immediate composer correspondent to composer dependencies

This adds a composer.json for all dependencies that are available

public/plugins/Comet/js/cometupdate.js

@@ -0,0 +1,27 @@
+// update the local timeline from a Comet server
+var CometUpdate = function()
+{
+     var _server;
+     var _timeline;
+     var _userid;
+     var _replyurl;
+     var _favorurl;
+     var _deleteurl;
+     var _cometd;
+
+     return {
+          init: function(server, timeline, userid, replyurl, favorurl, deleteurl)
+          {
+               _cometd = $.cometd; // Uses the default Comet object
+               _cometd.init(server);
+               _server = server;
+               _timeline = timeline;
+               _userid = userid;
+               _favorurl = favorurl;
+               _replyurl = replyurl;
+               _deleteurl = deleteurl;
+               _cometd.subscribe(timeline, function(message) { RealtimeUpdate.receive(message.data) });
+               $(window).unload(function() { _cometd.disconnect(); } );
+          }
+     }
+}();