add utf8.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>
实现multi_download转换url中带中文的字符串.
备注: http_stream依然不处理url中带中文的问题, 需要使用者自己处理, 处理方式可参照multi_download.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>
修改multi_download的vc工程文件.

Signed-off-by: Jack <jack.wgm@gmail.com>
update CMake script, add boost.locale

Signed-off-by: Jack <jack.wgm@gmail.com>
fixed unescape_path failed return

Signed-off-by: Jack <jack.wgm@gmail.com>
删除没有意义的代码, 不是任何东西都可以随便合并到master上的, 这是原则.

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

Signed-off-by: Jack <jack.wgm@gmail.com>
Merge branch 'master' of github.com:avplayer/avhttp