Vr.builder

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Switch to pkgutil-style namespace package.

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Pin against dependencies for namespace compatibility.

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Bump to vr.common 5.4.2 to restore support for short hashes
and detached tags.

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Bump vr.common to accept null revs

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Moved project to Github.

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

Enabled automatic releases of tagged commits.