add .gitattributes

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add zlib sources

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add remove BOM script

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
add pre-porcess script

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
set gpg document is binary

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>