Added init value for encoder->ref_list to fix valgrind warnings
Added init value for encoder->ref_list to fix valgrind warnings

This might help with issue #16
Thanks again to ps-auxw for pointing this out ;)

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