Add support for four.co.nz, and can_handle().
Add support for four.co.nz, and can_handle().

karjonas/get-flash-videos,pcwalden/get-flash-videos,pcwalden/get-flash-videos,vladrich/get-flash-videos,pcwalden/get-flash-videos,njtaylor/get-flash-videos,vladrich/get-flash-videos,monsieurvideo/get-flash-videos,vladrich/get-flash-videos,monsieurvideo/get-flash-videos,momo-i/get-flash-videos,karjonas/get-flash-videos,momo-i/get-flash-videos,momo-i/get-flash-videos,njtaylor/get-flash-videos,monsieurvideo/get-flash-videos,njtaylor/get-flash-videos,karjonas/get-flash-videos