remove unused import
force to reload manifest by tweaking the URL.
this it to avoid issues with browser/flash that are reloading from cache even if the remote URL has been updated
see http://stackoverflow.com/questions/14448219/as3-resetting-urlloader-cache
should improve https://github.com/mangui/HLSprovider/issues/65
fix playlist parsing issues, retrieve URL from next non commented line after #EXTINF
should fix https://github.com/mangui/HLSprovider/issues/68
all test playlists have been retested with this changes, and they are still working fine