Remove bbsync, add album art/url to youtube_mp3.

shell_scripts/bbsync
	-Remove the script used to sync music between my X1C and
	BlackBerry, because I no longer use the latter device.

shell_scripts/youtube_mp3
	-Robustify the script to accept either the URL or ID of any
	youtube video for download, as opposed to exclusively the
	ID.
	-Use `lame` to embed a randomly selected piece of album art in
	every downloaded mp3.