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, 58 insertions, 0 deletions

diff --git a/docs/authors.md b/docs/authors.md
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index 0000000..658707d
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+++ b/docs/authors.md
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+title: Authors
+
+Primary Authors
+===============
+
+* __[Waylan Limberg](http://achinghead.com/)__
+
+    Waylan is the current maintainer of the code and has written much of the
+    current code base, included a complete refactor of the core. He started out
+    by authoring many of the available extensions and later was asked to join
+    Yuri, where he began fixing numerous bugs, adding documentation and making
+    general improvements to the existing code base.
+
+* __[Yuri Takteyev](http://freewisdom.org/)__
+
+    Yuri wrote most of the code found in version 1.x while procrastinating his
+    Ph.D. Various pieces of his code still exist, most notably the basic
+    structure.
+
+* __[Manfed Stienstra](http://www.dwerg.net/)__
+
+    Manfed wrote the original version of the script and is responsible for
+    various parts of the existing code base.
+
+* __Artem Yunusov__
+
+    Artem, who as part of a 2008 GSoC project, refactored inline patterns,
+    replaced the NanoDOM with ElementTree support and made various other
+    improvements.
+
+* __David Wolever__
+
+    David refactored the extension API and made other improvements
+    as he helped to integrate Markdown into Dr.Project.
+
+Other Contributors
+==================
+
+The incomplete list of individuals below have provided patches or otherwise
+contributed to the project in various ways. We would like to thank everyone
+who has contributed to the project in any way.
+
+* Eric Abrahamsen
+* Jeff Balogh
+* Sergej Chodarev
+* Chris Clark
+* Tiago Cogumbreiro
+* Kjell Magne Fauske
+* G. Clark Haynes
+* Daniel Krech
+* Steward Midwinter
+* Jack Miller
+* Neale Pickett
+* Paul Stansifer
+* John Szakmeister
+* Malcolm Tredinnick
+* Ben Wilson
+* and many others who helped by reporting bugs