Fix most PackWriterTests, RevWalk is responsible for the last 4 failing
Fix most PackWriterTests, RevWalk is responsible for the last 4 failing

Signed-off-by: caytchen <caytchen@gmail.com>

Signed-off-by: Adriano Machado <0719a6e7fe25175181a9b76158d152592cce5ce5@hotmail.com>
henon/GitSharp,henon/GitSharp