改善断点续传时, 当后续请求文件大小发生改变的适应.

Signed-off-by: Jack <jack.wgm@gmail.com>
针对文件大小变动, 改善多点下载的example代码.

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添加cmake脚本支持zlib的编译.

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添加zlib库的安装在travis-ci编译测试环境.

Signed-off-by: Jack <jack.wgm@gmail.com>
旧版本的zlib不兼容的z_const问题.

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fixed missing start timer.

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改善file_name获取规则.

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multi_download默认不检查证书.

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改善从跳转url中获取文件名的方法.

Signed-off-by: Jack <jack.wgm@gmail.com>
该死, 这个修复被遗漏了...

Signed-off-by: Jack <jack.wgm@gmail.com>
improve http_stream implementation, fixed some warnings.

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fixed member initialize order.

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

Signed-off-by: Jack <jack.wgm@gmail.com>
fix some warnings for http_stream.hpp & multi_download.hpp.

Signed-off-by: Jack <jack.wgm@gmail.com>
fix class rangefield member initialize order.

Signed-off-by: Jack <jack.wgm@gmail.com>
稍微修改一下, 使其支持完成回调
更新 async_image_checker.hpp
总觉得这是不可思意
果然还是这样好
修正一个可能导致handler被重复调用的bug.

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