NixOS support
Merge pull request #133 from cosmo0920/nixos-support

Initial NixOS Linux support
Get file mtime
Merge pull request #135 from serverspec/get-file-mtime

Add a command to get mtime of a file
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Update subproject
Get file size
Merge pull request #136 from hirose31/get-file-size

Get file size
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Update subproject
fix square brackets error in cron resource type
Merge pull request #139 from tkak/fix-square-brackets-in-cron-entry

fix square brackets error in cron resource type
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Correcting small misspelling in error message generated in SpecInfra::Backend::Ssh
Merge pull request #140 from terrycorley/fix-error-message-typo

Correcting small misspelling in error message generated in SSH backend
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