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* Atom feeds output ``<content>`` in addition to ``<summary>``
* Atom feeds use ``<published>`` for the original publication date and
``<updated>`` for modifications
* Simplify Atom feed ID generation and support URL fragments
* Produce category feeds with category-specific titles
* RSS feeds now default to summary instead of full content;
set ``RSS_FEED_SUMMARY_ONLY = False`` to revert to previous behavior
* Replace ``MD_EXTENSIONS`` with ``MARKDOWN`` setting
* Replace ``JINJA_EXTENSIONS`` with more-robust ``JINJA_ENVIRONMENT`` setting
* Improve summary truncation logic to handle special characters and tags that
span multiple lines, using HTML parser instead of regular expressions
* Include summary when looking for intra-site link substitutions
* Link to authors and index via ``{author}name`` and ``{index}`` syntax
* Override widget names via ``LINKS_WIDGET_NAME`` and ``SOCIAL_WIDGET_NAME``
* Add ``INDEX_SAVE_AS`` option to override default ``index.html`` value
* Remove ``PAGES`` context variable for themes in favor of ``pages``
* ``SLUG_SUBSTITUTIONS`` now accepts 3-tuple elements, allowing URL slugs to
contain non-alphanumeric characters
* Tag and category slugs can be controlled with greater precision using the
``TAG_SUBSTITUTIONS`` and ``CATEGORY_SUBSTITUTIONS`` settings
* Author slugs can be controlled with greater precision using the
``AUTHOR_SUBSTITUTIONS`` setting
* ``DEFAULT_DATE`` can be defined as a string
* Use ``mtime`` instead of ``ctime`` when ``DEFAULT_DATE = 'fs'``
* Add ``--fatal=errors|warnings`` option for use with continuous integration
* When using generator-level caching, ensure previously-cached files are
processed instead of just new files.
* Add Python and Pelican version information to debug output
* Improve compatibility with Python 3.5
* Comply with and enforce PEP8 guidelines
* Replace tables in settings documentation with ``data::`` directives