Added new features#5

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hugozhu wants to merge 12 commits intosdidyk:masterfrom

Commits on Oct 26, 2015

added config option
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reverted
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Commits on Oct 27, 2015

added GetDialog method
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added chatmsg command
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Commits on Oct 28, 2015

updated
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Commits on Oct 30, 2015

Added SendMedia
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updated
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implemented sendMedia to support photo large than 512K
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Commits on Nov 14, 2015

Added socks5 proxy support, eg: export socks5_proxy=192.168.1.4:1080
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Updated readme
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Updated readme
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Updated readme
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