update .gitignore for vc

Signed-off-by: Jack <jack.wgm@gmail.com>
统一settings中参数风格.

Signed-off-by: Jack <jack.wgm@gmail.com>
add multi_download project for vc2005

Signed-off-by: Jack <jack.wgm@gmail.com>
1. 为multi_download添加check_certificate函数, 控制是否认证ssl证书.
2. settings中添加check_certificate, 默认为认证ssl证书.
3. multi_download 由原来的默认不认证, 修改为默认为认证.

Signed-off-by: Jack <jack.wgm@gmail.com>