fix youtube plugin verify_age function to handle 301 responses

[Paczesiowa]

paczesiowa@desktop ~/projects/get-flash-videos $ ./get_flash_videos --debug www.youtube.com/watch?v=mGG6TlanJWs 1 plugin installed:

• Joemonster.pm Trying to open plugin ~/.get_flash_videos/plugins/Www.pm Trying to open plugin ~/.get_flash_videos/plugins/Youtube.pm Using method 'youtube' plugin version 0.01 for http://www.youtube.com/watch?v=mGG6TlanJWs Downloading http://www.youtube.com/watch?v=mGG6TlanJWs -> GET http://www.youtube.com/watch?v=mGG6TlanJWs <- 301 text/html; charset=utf-8 (0) Error: Couldn't download URL: 301 Moved Permanently at /home/paczesiowa/projects/get-flash-videos/lib/FlashVideo/Site/Youtube.pm line 392.

It works fine with this change.

[njtaylor]

I had another fix mailed which changes line 382, to either 301 or 302. plugin version changed to 0.02. These changes have been committed.