Display only the first video of a playlist, without showing the video gallery.

other improvements are included:

• A template to know how to display videos on the gallery can be edited in the XSL
• Number of request to YouTube API is greatly reduced
• Maximum number of videos by galley can now be set, with a maximum of 200 videos
• setting 1 to this parameter will display only the first video of a playlist, without showing the video gallery.
• A custom message can be displayed for internet explorer users