add body_callback_func to option.

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添加用户回调调用.

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improve errc::continue_request.

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Merge branch 'master' of github.com:avplayer/avhttp
fixed utf8.

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use errc::continue_request for POST.

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add Expect option for POST.

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add recvive_header && remove request_impl.

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implementation async_receive_header for http_stream.

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

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improve write_tail.

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fixed typo.

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