add mount.cifs

<a href="https://github.com/epipho"><img src="https://avatars.githubusercontent.com/u/622665?v=3" align="left" width="96" height="96" hspace="10"></img></a> **Issue by [epipho](https://github.com/epipho)**
_Thursday May 08, 2014 at 16:45 GMT_
_Originally opened as https://github.com/coreos/coreos-overlay/issues/595_

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For those of us that need to share files with a windows host.
