Updated nan to 1.8.4 to work with io.js v2.3.1#7

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kieut wants to merge 2 commits intoTopface:masterfrom kieut:master

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Commits on Jun 30, 2015

Updated nan to 1.8.4
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Commits on Jul 1, 2015

Reverted cstdint deletion, the header can be found under tr1 directory.
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