CC-2430: Preview tracks in the library + better preview (ability to jump around in clip)

- removed javascript from php files
- removed preview.js
- fixed small problems with editor

airtime_mvc/public/js/jplayer/skin/jplayer.audio-preview.blue.monday.css

@@ -92,7 +92,9 @@ div.jp-video div.jp-interface {
 span.filename {
     display:none; 
 }
-
+span.name {
+    display:none; 
+}
 /* @group CONTROLS */
 
 div.jp-controls-holder {