Vr-runners

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* Removed vrun_precise command and vr.runners.precise module.

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* Don't attempt to save a file that returns a 404 (or other error).

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* 188: Support later kernels by having overlayfs configuration
depending on LXC version

* Environment variables written as ``$VARNAME`` are substituted
with the value present on the host.

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* 215: Don't attempt to teardown a directory that doesn't
exist.

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Moved project to Github.

Incorporated `project
skeleton from jaraco <https://github.com/jaraco/skeleton>`_.

Enabled automatic releases of tagged commits.