Back from the dead

Removed long-dead video sites. Updated code to get most sites working again. Improved handling of proxy servers. Added new sites: www.imdb.com, www.ign.com, www.ebaumsworld.com, www.gamestar.de, openclassroom.stanford.edu. Added -np option to specify a 'now playing' file for use with ICY/icecast internet radio stations. Added -U option to specify user-agent string.