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New feature and bugfix release. Minor API breakage.
* add explicit Markdown, Python, Notebook builders. You can build the whole
site to Markdown with commands like ``sphinx-build -b markdown -d dt_dir
src_dir md_dir``.
* add ability of Markdown etc builders to resolve internal references relative
to an HTTP build, using new ``markdown_http_base`` configuration option;
* API break - change of template specification for epilogue to ``nbplot``
output; no longer include the source code in the template, but evaluate
source code as ReST separately. This will cause anyone using custom
templates pain, as their code will crash. To fix, simply remove the
reference to source code in the template;
* slightly extend range of doctree nodes that Markdown converter can deal
with.
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