Piecrust

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* Update ``requirements.txt`` .
* Update development ``requirements.txt`` , add code coverage tools.

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23. PieCrust 2.0.0a7 (2015-04-20)
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* tests: Changes to output report and hack for comparing outputs.

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* caching: Use separate caches for config variants and other contexts.
* config: Add method to deep-copy a config and validate its contents.
* internal: Return the first route for a source if no metadata match is needed.
* linker: Don't put linker stuff in the config.

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* bake: Fix crash when handling bake errors.
* serve: Giant refactor to change how we handle data when serving pages.
* serve: Refactoring and fixes to be able to serve taxonomy pages.
* sources: Default source lists pages in order.
* sources: Fix how the ``autoconfig`` source iterates over its structure.
* theme: Fix link to PieCrust documentation.

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* docs: Add documentation for deploying as a dynamic CMS.
* docs: Add lame bit of documentation on publishing your website.
* setup: Keep the requirements in sync between ``setuptools`` and ``pip`` .
* tests: Add a Chef test for the ``find`` command.
* tests: Add support for "Chef tests", which are direct CLI tests.
* tests: Fix serving unit-tests.

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22. PieCrust 2.0.0a8 (2015-05-03)
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* data: Fix problems with using non-existing metadata on a linked page.
* internal: Make it possible to pass ``argv`` to the main Chef function.
* routing: Fix bugs with matching URLs with correct route but missing metadata.