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fixed vc2012 project

Signed-off-by: Jack <jack.wgm@gmail.com>
fixed missing include boost.array header

Signed-off-by: Jack <jack.wgm@gmail.com>
remove protected bind & replace to boost.function

Signed-off-by: Jack <jack.wgm@gmail.com>
remove all protected bind

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

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

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

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