Youtube class modified. There was a bug, the player was only able to
load the first video, no matter you were selecting a different video
from the list. Now it is solved and every time a video is selected from
the list view, the player is refreshed. Now a YouTubePlayer needs to be
set from the Activity where videos wants to be played. I would recommend
to do it inside of the OnInitiliazedSucess method which implements the
YoutubePlayer.OnInitilizedListener.