add header support in swagger_doc#17

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Skipper1992 wants to merge 7 commits intoelixir-maru:masterfrom

Skipper1992:master

Commits on Feb 8, 2017

change maru

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Michael
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update maru

Michael
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Michael
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update maru

Michael
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Michael
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add header params gen

Michael
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Michael
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gen header desc support

Michael
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Michael
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Commits on Feb 9, 2017

change code style

Michael
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Michael
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remove IEx

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Michael
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