UTF-8 login fix for Frodo

Hey!

The issue fixed in https://github.com/HenrikDK/youtube-xbmc-plugin/pull/10 was not got pulled to the `frodo` branch, thus make the plugin unusable when UTF-8 characters are met during login (most of Central-European accounts)

The fix commited was found found in https://code.google.com/p/youtubexbmc/issues/detail?id=106 

Regards:
obrien