Markups

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* Markdown markup: fixed detection of codehilite extension with options.
* Added a warning about deprecation of the markups.web module.

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* PyMarkups now uses warnings system instead of printing messages to
stderr.
* Improvements to Markdown markup:

+ Fixed parsing math that contains nested environments (thanks to Gautam
Iyer for the patch).
+ Fixed crash on extensions names starting with dot.

* Miscellaneous fixes.

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Incompatible changes:

* Custom markups are now normal Python modules.
* Web module no longer supports Python 2.x.

Other changes:

* Refactor the code related to Markdown extensions to make it work with
upcoming Python-Markdown releases.
* MathJax extension is now in a separate module.

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* Fixed loading of Markdown extensions with options.

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* Fixed Markdown markup crash on empty files.
* Include documentation in the tarballs.
* Testsuite improvements.

=======================

* Improvements to Markdown markup:

+ All math delimiters except ``$...$`` are now enabled by default.
+ ``remove_extra`` extension now disables formulas support.
+ It is now possible to specify required extensions in the first line of
the file.

* Add Sphinx documentation.