Sphinx-math-dollar

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- Drop Python 2.7 support (oscargus).
- Make the extension more future-proof against future docutils versions
(thanks gmilde).
- Mark the extension as parallel read safe (namurphy).
- Update versioneer (oscargus).
- Replace sphinx-testing with sphinx.testing (oscargus).

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- Add support for double dollar signs for display math.

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- Fix a bug where the extension would force a full rebuild every time. Note
that the ``math_dollar_node_blacklist`` config value now no longer
automatically triggers a rebuild when it is changed, as it is impossible to
do so without rebuilding every time.

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- Allow ``$math$`` in more places.
- Add the configuration variable ``math_dollar_node_blacklist`` to configure
which docutils nodes should not have ``$math$`` replaced.
- Add tests for the extension part of the code.
- Add ``math_dollar_debug`` configuration options and ``MATH_DOLLAR_DEBUG``
environment variable to print out debug info on when ``$math$`` is skipped.

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Initial release.