CC-1799 Put Airtime Storage into a Human Readable File Naming Convention

adding music dirs concept to Airtime. New cc_music_dirs table/class.

airtime_mvc/application/Bootstrap.php

@@ -16,6 +16,7 @@ require_once __DIR__."/configs/conf.php";
 require_once 'DB.php';
 
 require_once 'Soundcloud.php';
+require_once 'MusicDir.php';
 require_once 'Playlist.php';
 require_once 'StoredFile.php';
 require_once 'Schedule.php';