boost 1.54 compatiable fix
add BOOST_ASIO_MOVE_ARG for Handler.

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add AVHTTP_*_HANDLER_CHECK for avhttp.

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

Conflicts:
	include/avhttp/impl/http_stream.ipp

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Fix "invalid suffix on literal; C++11 requires a space between literal and identifier" error.
improve end chunked for gzip.

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update to version 2.9.1

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remove downlad_mode

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avoid create empty file.

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fix forget call handler
disable multi_download download dynamic pages.

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add allow_dynamic_pages for multi_download.

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remove dynamic page detect, change allow_dynamic_pages to disable_multi_download.

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correct comment

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improve http_stream

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add std=c++11

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travis-ci.org gcc too old

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build c++11 branch as well
boost 1.54 ppa not found, install manully
change content_length, default to -1.

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