docs: add up to date documentation for AsyncWrap#27

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AndreasMadsen merged 5 commits intonodejs:masterfrom

AndreasMadsen:master

Oct 17, 2015

Commits on Oct 5, 2015

docs: add up to date documentation for AsyncWrap
AndreasMadsen
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Commits on Oct 8, 2015

docs: incorporate Trevis comments into the AsyncWrap documentation
AndreasMadsen
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docs: minor spelling corrections, thanks Stephen
AndreasMadsen
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Commits on Oct 14, 2015