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* config: Make sure ``site/auto_formats`` has at least ``html`` .
* formatting: Add support for Markdown extension configs.
* internal: Correctly split sub URIs. Add unit tests.
* internal: Fix some edge-cases for splitting sub-URIs.
* internal: Fix timing info.
* internal: Improve handling of taxonomy term slugification.
* internal: Return ``None`` instead of raising an exception when finding pages.
* templating: Add ``now`` global to Jinja, improve date error message.
* templating: Make Jinja support arbitrary extension, show warning for old stuff.
* templating: ``highlight_css`` can be passed the name of a Pygments style.