fs: add access() and accessSync()#114

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cjihrig wants to merge 2 commits intonodejs:v0.12from

cjihrig:fs.access

Commits on Dec 9, 2014

fs: add access() and accessSync()
cjihrig
committed

Commits on Dec 10, 2014

remove the excess value returned by access{Sync}().
cjihrig
committed