enable proxy if https_proxy taken by env#39

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muddydixon wants to merge 3 commits intowit-ai:mainfrom muddydixon:feature/proxy

+21-1

Commits on May 20, 2016

added proxy if https_proxy taken by env
muddydixon
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Commits on Jun 14, 2016

supported http/s proxy
muddydixon
committed

Commits on Nov 18, 2016

fix: according to comment
muddydixon
committed