Fix fs.exists function#47

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mattzeunert wants to merge 11 commits intokriszyp:masterfrom

mattzeunert:master

Commits on Oct 29, 2013

Commits on Dec 22, 2013

Commits on Jan 3, 2014

Set the correct patr dependency (to one that exists)
kriszyp
committed

Commits on Jan 19, 2014

Fix fs.exists which doesn't have an error parameter.
mattzeunert
committed

Commits on Jan 20, 2014