fixed http header missing value.

Signed-off-by: Jack <jack.wgm@gmail.com>
to utf8 encode.

Signed-off-by: Jack <jack.wgm@gmail.com>
improve error_code and ERROR_LOG

Signed-off-by: Jack <jack.wgm@gmail.com>
improve utf8.hpp

Signed-off-by: Jack <jack.wgm@gmail.com>
improve utf8 encode/decode.

Signed-off-by: Jack <jack.wgm@gmail.com>
missing explicit for avhttp class interface.

Signed-off-by: Jack <jack.wgm@gmail.com>
add example ip138.cpp

Signed-off-by: Jack <jack.wgm@gmail.com>
Update ip138.cpp

trim ip parameters.
add comment for ip138
fix utf8.hpp 编译警告
Merge pull request #13 from avplayer/master

update