Added arities to exchange methods for request headers#149

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thinkingmik wants to merge 3 commits intojaredhanson:masterfrom

thinkingmik:master

Commits on Jan 10, 2016

added new arity req.header to all requests params in the exchange middlewares
thinkingmik
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added new arity req.headers to all requests params in the exchange middlewares
thinkingmik
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Commits on Jan 16, 2016

add test cases for all arities
thinkingmik
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