file implementation.

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add request_option for file_upload.

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update multi_download.ipp

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update storage_interface

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remove #include "avhttp/file.hpp"

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update vcxproj

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update load_from_file&save_to_file.

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add default_storage.hpp

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Merge branch 'master' of github.com:avplayer/avhttp
use dos2unix.

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use default_storge for multi_download [skip ci]

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