Exhibition

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- Added vesrioneer.
- Fix bug where ``exhibit serve`` was not serving files with extension
stripping enabled.
- A ``KeyError`` raised by ``Config`` now display the path of the node they are
attached to, making debuging missing keys far easier.
- Improved test coverage and fixed numerous bugs.
- Implemented cache busting for static assets (images, CSS, and such). Use the
``cache_bust_glob`` option to control which files are cache busted.
- Implemented ``Node.get_from_path`` which can fetch a
:class:`exhibition.main.Node` specified by a path.
- Make all Exhibition defined meta keys use underscores not hyphens.

.. _zero-zero-three:

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- Fix bug where extension stripping was not being applied.

.. _zero-zero-two:

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- Fixed trove classifiers.
- Add ``__version__`` to ``exhibition.__init__``.

.. _zero-zero-one:

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Everything is new! Some choice features:

- Configuration via YAML files and YAML front matter.
- Jinja2 template engine is provided by default.
- A local HTTP server for development work.
- Less than 2000 lines of code, including tests.