Switch docs to MKDocs (#602)

Fixes #601. Merged in 6f87b32 from the md3 branch and did a lot of cleanup.

Changes include:

* Removed old docs build tool, templates, etc.

* Added MkDocs config file, etc.

* filename.txt => filename.md

* pythonhost.org/Markdown => Python-Markdown.github.io

* Markdown lint and other cleanup.

* Automate pages deployment in makefile with `mkdocs gh-deploy`

    Assumes a git remote is set up named "pages". Do

        git remote add pages https://github.com/Python-Markdown/Python-Markdown.github.io.git

    ... before running `make deploy` the first time.

1 files changed, 226 insertions, 0 deletions

diff --git a/docs/change_log/index.md b/docs/change_log/index.md
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+title:      Change Log
+
+Python-Markdown Change Log
+=========================
+
+Aug 17, 2017: Released version 2.6.9 (a bug-fix release).
+
+Jan 25, 2017: Released version 2.6.8 (a bug-fix release).
+
+Sept 23, 2016: Released version 2.6.7 (a bug-fix release).
+
+Mar 20, 2016: Released version 2.6.6 (a bug-fix release).
+
+Nov 24, 2015: Released version 2.6.5 (a bug-fix release).
+
+Nov 6, 2015: Released version 2.6.4 (a bug-fix release).
+
+Oct 26, 2015: Released version 2.6.3 (a bug-fix release).
+
+Apr 20, 2015: Released version 2.6.2 (a bug-fix release).
+
+Mar 8, 2015: Released version 2.6.1 (a bug-fix release). The (new)
+`yaml` option has been removed from the Meta-Data Extension as it was buggy
+(see [#390](https://github.com/Python-Markdown/markdown/issues/390)).
+
+Feb 19, 2015: Released version 2.6 ([Notes](release-2.6.md)).
+
+Nov 19, 2014: Released version 2.5.2 (a bug-fix release).
+
+Sept 26, 2014: Released version 2.5.1 (a bug-fix release).
+
+Sept 12, 2014: Released version 2.5.0 ([Notes](release-2.5.md)).
+
+Feb 16, 2014: Released version 2.4.0 ([Notes](release-2.4.md)).
+
+Mar 22, 2013: Released version 2.3.1 (a bug-fix release).
+
+Mar 14, 2013: Released version 2.3.0 ([Notes](release-2.3.md))
+
+Nov 4, 2012: Released version 2.2.1 (a bug-fix release).
+
+Jul 5, 2012: Released version 2.2.0 ([Notes](release-2.2.md)).
+
+Jan 22, 2012: Released version 2.1.1 (a bug-fix release).
+
+Nov 24, 2011: Released version 2.1.0 ([Notes](release-2.1.md)).
+
+Oct 7, 2009: Released version 2.0.3. (a bug-fix release).
+
+Sept 28, 2009: Released version 2.0.2 (a bug-fix release).
+
+May 20, 2009: Released version 2.0.1 (a bug-fix release).
+
+Mar 30, 2009: Released version 2.0 ([Notes](release-2.0.md)).
+
+Mar 8, 2009: Release Candidate 2.0-rc-1.
+
+Feb 2009: Added support for multi-level lists to new Blockprocessors.
+
+Jan 2009: Added HTML 4 output as an option (thanks Eric Abrahamsen)
+
+Nov 2008: Added Definition List ext. Replaced old core with Blockprocessors.
+Broken up into multiple files.
+
+Oct 2008: Changed logging behavior to work better with other systems.
+Refactored tree traversing. Added `treap` implementation, then replaced with
+OrderedDict. Renamed various processors to better reflect what they actually
+do. Refactored footnote ext to match PHP Extra's output.
+
+Sept 2008: Moved `prettifyTree` to a Postprocessor, replaced WikiLink ext
+with WikiLinks (note the s) ext (uses bracketed links instead of CamelCase)
+and various bug fixes.
+
+August 18 2008: Reorganized directory structure. Added a 'docs' directory
+and moved all extensions into a 'markdown-extensions' package.
+Added additional documentation and a few bug fixes. (v2.0-beta)
+
+August 4 2008: Updated included extensions to ElementTree. Added a
+separate command line script. (v2.0-alpha)
+
+July 2008: Switched from home-grown NanoDOM to ElementTree and
+various related bugs (thanks Artem Yunusov).
+
+June 2008: Fixed issues with nested inline patterns and cleaned
+up testing framework (thanks Artem Yunusov).
+
+May 2008: Added a number of additional extensions to the
+distribution and other minor changes. Moved repository to git from svn.
+
+Mar 2008: Refactored extension API to accept either an
+extension name (as a string) or an instance of an extension
+(Thanks David Wolever). Fixed various bugs and added doc strings.
+
+Feb 2008: Various bug-fixes mostly regarding extensions.
+
+Feb 18, 2008: Version 1.7.
+
+Feb 13, 2008: A little code cleanup and better documentation
+and inheritance for Preprocessors/Postprocessors.
+
+Feb 9, 2008: Double-quotes no longer HTML escaped and raw HTML
+honors `<?foo>`, `<@foo>`, and `<%foo>` for those who run markdown on
+template syntax.
+
+Dec 12, 2007: Updated docs. Removed encoding argument from Markdown
+and markdown as per list discussion. Clean up in prep for 1.7.
+
+Nov 29, 2007: Added support for images inside links. Also fixed
+a few bugs in the footnote extension.
+
+Nov 19, 2007: `message` now uses python's logging module. Also removed
+limit imposed by recursion in `_process_section()`. You can now parse as
+long of a document as your memory can handle.
+
+Nov 5, 2007: Moved `safe_mode` code to a `textPostprocessor` and added
+escaping option.
+
+Nov 3, 2007: Fixed convert method to accept empty strings.
+
+Oct 30, 2007: Fixed `BOM` removal (thanks Malcolm Tredinnick). Fixed
+infinite loop in bracket regular expression for inline links.
+
+Oct 11, 2007: `LineBreaks` is now an `inlinePattern`. Fixed `HR` in
+blockquotes. Refactored `_processSection` method (see tracker #1793419).
+
+Oct 9, 2007: Added `textPreprocessor` (from 1.6b).
+
+Oct 8, 2008: Fixed Lazy Blockquote. Fixed code block on first line.
+Fixed empty inline image link.
+
+Oct 7, 2007: Limit recursion on inline patterns. Added a 'safe' tag
+to `htmlStash`.
+
+March 18, 2007: Fixed or merged a bunch of minor bugs, including
+multi-line comments and markup inside links. (Tracker #s: 1683066,
+1671153, 1661751, 1627935, 1544371, 1458139.) -> v. 1.6b
+
+Oct 10, 2006: Fixed a bug that caused some text to be lost after
+comments.  Added "safe mode" (user's HTML tags are removed).
+
+Sept 6, 2006: Added exception for PHP tags when handling HTML blocks.
+
+August 7, 2006: Incorporated Sergej Chodarev's patch to fix a problem
+with ampersand normalization and HTML blocks.
+
+July 10, 2006: Switched to using `optparse`.  Added proper support for
+Unicode.
+
+July 9, 2006: Fixed the `<!--@address.com>` problem (Tracker #1501354).
+
+May 18, 2006: Stopped catching unquoted titles in reference links.
+Stopped creating blank headers.
+
+May 15, 2006: A bug with lists, recursion on block-level elements,
+run-in headers, spaces before headers, Unicode input (thanks to Aaron
+Swartz). Sourceforge tracker #s: 1489313, 1489312, 1489311, 1488370,
+1485178, 1485176. (v. 1.5)
+
+Mar. 24, 2006: Switched to a not-so-recursive algorithm with
+`_handleInline`.  (Version 1.4)
+
+Mar. 15, 2006: Replaced some instance variables with class variables
+(a patch from Stelios Xanthakis).  Chris Clark's new regexps that do
+not trigger mid-word underlining.
+
+Feb. 28, 2006: Clean-up and command-line handling by Stewart
+Midwinter. (Version 1.3)
+
+Feb. 24, 2006: Fixed a bug with the last line of the list appearing
+again as a separate paragraph.  Incorporated Chris Clark's "mail-to"
+patch.  Added support for `<br />` at the end of lines ending in two or
+more spaces.  Fixed a crashing bug when using `ImageReferencePattern`.
+Added several utility methods to `Nanodom`.  (Version 1.2)
+
+Jan. 31, 2006: Added `hr` and `hr/` to BLOCK_LEVEL_ELEMENTS and
+changed `<hr/>` to `<hr />`.  (Thanks to Sergej Chodarev.)
+
+Nov. 26, 2005: Fixed a bug with certain tabbed lines inside lists
+getting wrapped in `<pre><code>`.  (v. 1.1)
+
+Nov. 19, 2005: Made `<!...`, `<?...`, etc. behave like block-level
+HTML tags.
+
+Nov. 14, 2005: Added entity code and email auto-link fix by Tiago
+Cogumbreiro.  Fixed some small issues with backticks to get 100%
+compliance with John's test suite.  (v. 1.0)
+
+Nov. 7, 2005: Added an `unlink` method for documents to aid with memory
+collection (per Doug Sauder's suggestion).
+
+Oct. 29, 2005: Restricted a set of HTML tags that get treated as
+block-level elements.
+
+Sept. 18, 2005: Refactored the whole script to make it easier to
+customize it and made footnote functionality into an extension.
+(v. 0.9)
+
+Sept. 5, 2005: Fixed a bug with multi-paragraph footnotes.  Added
+attribute support.
+
+Sept. 1, 2005: Changed the way headers are handled to allow inline
+syntax in headers (e.g. links) and got the lists to use p-tags
+correctly (v. 0.8)
+
+Aug. 29, 2005: Added flexible tabs, fixed a few small issues, added
+basic support for footnotes.  Got rid of xml.dom.minidom and added
+pretty-printing. (v. 0.7)
+
+Aug. 13, 2005: Fixed a number of small bugs in order to conform to the
+test suite.  (v. 0.6)
+
+Aug. 11, 2005: Added support for inline HTML and entities, inline
+images, auto-links, underscore emphasis. Cleaned up and refactored the
+code, added some more comments.
+
+Feb. 19, 2005: Rewrote the handling of high-level elements to allow
+multi-line list items and all sorts of nesting.
+
+Feb. 3, 2005: Reference-style links, single-line lists, backticks,
+escape, emphasis in the beginning of the paragraph.
+
+Nov. 2004: Added links, blockquotes, HTML blocks to Manfred
+Stienstra's code
+
+Apr. 2004: Manfred's version at <http://www.dwerg.net/projects/markdown/>
+