Upgrade libpng to version 1.6.16
升级libpng到v1.6.16
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Add GnuPG public key for git-tag
为git-tag添加GPG公钥Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
rename MySelfCert.cer to rootcert.cer
重命名MySelfCert.cer为rootcert.cer
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
remove BOM and add newline at end of file
去除BOM，添加件结尾换行符
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Upgrade libpng to version 1.6.16 and update dumpImageSize
升级libpng到v1.6.16，更新dumpImageSize
Merge branch 'dev-2'

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Merge branch 'master' into dev-2

Signed-off-by: Wanpeng Song <swpustc@mail.ustc.edu.cn>
Fix local repository URL
修正本地仓库网址

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