Added B-frame encoding and reference list exceptions for top-layer GOP pictures
Added B-frame encoding and reference list exceptions for top-layer GOP pictures

ultravideo/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar,lu-zero/kvazaar,lu-zero/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,ultravideo/kvazaar,lu-zero/kvazaar