Ploy-ezjail

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* Fixes to make ``[instance:...]`` using an ez-master work.
[fschulze]

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* Added ``instance`` option to ez-master section to use another instance as
the jail host.
[fschulze, tomster]

* Moved setuptools-git from setup.py to .travis.yml, it's only needed for
releases and testing.
[fschulze]

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* Initial release
[fschulze]