Add http(s) proxy support

wangshijun commented 7 years ago

My users donot have direct network access to api.ai, but the proxy feature is missing from current version, so I implemented proxy feature with the awesome proxy-agent lib.

googlebot commented 7 years ago

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wangshijun commented 7 years ago

I signed it!

googlebot commented 7 years ago

CLAs look good, thanks!