Added WWW-Authenticate response header to avoid Kohana 3.3 exception on 401 HTTP_Exceptions

Signed-off-by: Darren Ehlers <me@darrenehlers.com>
Removed test auth HDR generation code comments

Signed-off-by: Darren Ehlers <me@darrenehlers.com>
Merge pull request #4 from DoubleNode/master

Added WWW-Authenticate response header to avoid Kohana 3.3 exception on 401 HTTP_Exceptions