符合container定义，支持使用boost::assign::insert()
添加　avhttp::http_stream::get_io_servier()

和 asio 的其他库保持一致
change progress to avhttp.cpp

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update example multi_download.cpp

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missing space line

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fixed when bytes_transferred equal 0

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improve multi_download.hpp code style

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add settings.hpp for multi_download & http_stream

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delete options.hpp, move to settings.hpp

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improve multi_download.hpp & http_stream.hpp

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fixed vc2012 project files

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update vc2005 project

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change settings.hpp to utf8

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add io.hpp for write/read binary

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update vc2012 project

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add code for socks proxy

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socks support implementiation...

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implement socks proxy protocol

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fixed missing socks_connect call

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improve socks proxy

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