Jaraco.services

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4: Use ``sys.executable`` when building tox envs.

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Added new ``envs/ToxEnv`` which leverages tox for defining
and building environments.

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3: Service envs are now created in ``.cache/services`` by
default and no longer consider whether the services are
being created in a virtualenv. This allows all services to
be created in one flat system. Clients that wish to continue
to create services within a virtualenv's root should override
the envs.VirtualEnv.root property (on the class or the
instance).

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Add missing dependency on virtualenv.

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Added ``jaraco.services.envs`` with ``VirtualEnv`` class.

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2: Correct scope for ``port`` reference in HTTPStatus error
template.