Ploy

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* Fix uid method for master instances.
[fschulze]

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* Print plugin versions with ``-v`` and ``--versions``.
[fschulze]

* Python 3 compatibility.
[fschulze]

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* Let plugins add type of lists to show with the ``list`` command.
[fschulze]

* Use ``server`` and ``instance`` consistently.
[fschulze]

* Always make instances accessible by their full name in the form of
"[master_id]-[instance_id]". Only if there is no conflict, the short version
with just "[instance_id]" is also available for convenience.
[fschulze]

* Add instance id validator which limits to letters, numbers, dashes and
underscores.
[fschulze]

* Renamed from mr.awsome to ploy.
[fschulze]

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* Give a bit more info on ssh connection failures.
[fschulze]

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* Expose some test fixtures for reuse in plugins.
[fschulze]

* Add before_terminate and after_start hooks and make it simple for plugins
to add their own hooks.
[fschulze]

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* Add ``get_path`` method to ConfigSection class.
[fschulze]