CC-3192: Problem with web uploads for Airtime 2.0.0 beta2

- The bug was introduced with CC-3086. When file is large enough so
the pluload use chucking, it would create different temp name for each
chuck.
- Fixed it by using unique_name feature on plupload

airtime_mvc/public/js/airtime/library/plupload.js

@@ -6,6 +6,7 @@ $(document).ready(function() {
 		runtimes : 'gears, html5, html4',
 		url : '/Plupload/upload/format/json',
 		chunk_size: '5mb',
+		unique_names: 'true',
 		multiple_queues : 'true',
 		filters : [
 			{title: "Audio Files", extensions: "ogg,mp3"}
@@ -52,7 +53,6 @@ $(document).ready(function() {
 		uploadProgress = false;
 	});
 	
-	
 	$(window).bind('beforeunload', function(){
 		if(uploadProgress){
 			if(!confirm("You are currently uploading files.\nGoing to another screen will cancel the upload process.\nAre you sure you want to cancel the upload process and go to the screen you clicked on?")){