Support promises in the `fs` module#173

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bajtos wants to merge 3 commits intonodejs:v0.12from

strongloop-forks:feature/promise-based-api-for-fs

Commits on Dec 16, 2014

benchmark: forward execArgv to spawned childs
Miroslav Bajtoš
committed
fs: promisify fs.stat and fs.readFile
Miroslav Bajtoš
committed

Commits on Jan 6, 2015

fixup! pass data to cb in benchmark
Miroslav Bajtoš
committed