Port test-fs-fsync from node.js
Port test-fs-fsync from node.js

sousoux/luvit,GabrielNicolasAvellaneda/luvit-upstream,DBarney/luvit,AndrewTsao/luvit,kaustavha/luvit,sousoux/luvit,sousoux/luvit,zhaozg/luvit,DBarney/luvit,boundary/luvit,luvit/luvit,bsn069/luvit,GabrielNicolasAvellaneda/luvit-upstream,boundary/luvit,GabrielNicolasAvellaneda/luvit-upstream,connectFree/lev,connectFree/lev,rjeli/luvit,rjeli/luvit,bsn069/luvit,DBarney/luvit,zhaozg/luvit,boundary/luvit,sousoux/luvit,DBarney/luvit,AndrewTsao/luvit,sousoux/luvit,boundary/luvit,bsn069/luvit,rjeli/luvit,GabrielNicolasAvellaneda/luvit-upstream,kaustavha/luvit,AndrewTsao/luvit,boundary/luvit,kaustavha/luvit,sousoux/luvit,luvit/luvit,rjeli/luvit,boundary/luvit