Add UseContext to respond pipe#290

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tiredknees wants to merge 3 commits intopardahlman:2.0from

Commits on Nov 1, 2017

Add UseContext pipe extension to respond operation.
tiredknees
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Commits on Nov 3, 2017

Don't set message context type if context func is supplied
tiredknees
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Commits on Nov 9, 2017

Expose subscription bug where message doesn't make it to error exchange
tiredknees
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