Convert Dev to Markdown and update with Google Groups address

dev/index.md

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+---
+layout: default
+title: Development
+---
+
+Development
+===========
+
+Here are some pieces of information regarding development in Window Maker.
+
+Source code versioning system
+-----------------------------
+
+The source code for Window Maker is contained in a [git](http://git-scm.com/)
+repository located [here](http://repo.or.cz/w/wmaker-crm.git).  To obtain a
+full-fledged copy of the repository do this:
+
+    git clone git://repo.or.cz/wmaker-crm.git
+
+There are two main branches in the repository, called 'master' and 'next'. The
+purpose of the 'next' branch is to add and extra layer of testing before the
+patches hit the 'master' branch. It is rebased when needed. The 'master' branch
+should ideally never be rebased -- if it is, run to the nearest
+anti-nuclear bunker.
+
+Submitting patches
+------------------
+
+The Window Maker source code follows the
+[coding style of the linux kernel](https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/coding-style.rst).
+Respect it when submitting patches.
+
+If you are not familiar with git, take a look at the
+[git homepage](http://git-scm.com/) -- it contains the kind of documentation you
+need to get started. You should also read the file contained in the Window Maker
+repository [The perfect Window Maker
+patch](http://repo.or.cz/w/wmaker-crm.git/blob/HEAD:/The-perfect-Window-Maker-patch.txt)
+which gives you further details about patches to Window Maker.
+
+Patches not submitted according to the above guidelines will not be accepted.
+
+Last but not least, patches doing code cleanups are **STRONGLY** encouraged.
+
+Git repository for dockapps
+---------------------------
+
+There is also a [git repository](http://repo.or.cz/w/dockapps.git) containing a
+few dockapps which apparently have no maintainers anymore. Patches for those
+dockapps (or to include more apps) can also be sent to
+<wmaker-dev@googlegroups.com>.
+
+Some sources of information
+---------------------------
+
+* [The Window Maker WINGs library]({{ site.baseurl }}/docs/wings.html).
+* [The Xlib Manual](http://tronche.com/gui/x/xlib/)