Clusterdock

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* Added support for executing commands in detached mode.

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* Fixed broken fix of volume handling from previous release.

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* Fixed handling of duplicate networks.
* Made :py:meth:`clusterdock.models.Node.execute` run commands in a shell
(using ``/bin/sh`` by default).
* Fixed handling of volumes passed to :py:class:`clusterdock.models.Node`.

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* Changed return type of :py:meth:`clusterdock.models.Cluster.execute`
and :py:meth:`clusterdock.models.NodeGroup.execute`.
* Added support for node devices.

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* Updated :py:meth:`clusterdock.models.Node.execute` to return a namedtuple with the
command's exit code and output.
* Fixed bug around ``quiet`` argument to :py:meth:`clusterdock.models.Node.execute`.
* Added support for specifying ``host:container`` port mappings when creating a node.
* Added ``ip_address`` attribute to :py:class:`clusterdock.models.Node`.

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* Removed :py:const:`DEFAULT_NAMESPACE` to let topologies define their own.