New enthusiastic contribution guide based on Audreyr's cookiecutter-pypackage

Audrey's code is BSD, so there should be no problem with licensing.

I've covered:
* contribution types (with hints)
* steps to start with pytest development
* testing pytest
* basics of hg

--HG--
branch : contributiondocs

doc/en/contents.txt

@@ -16,7 +16,7 @@ Full pytest documentation
    plugins
    example/index
    talks
-   develop
+   contribute
    funcarg_compare.txt
    announce/index
 

doc/en/contribute.txt

@@ -0,0 +1,122 @@
+.. _contributing:
+
+============
+Contributing
+============
+
+Contributions are highly welcomed and appreciated.  Every little help counts,
+so do not hesitate!
+
+Types of contributions
+======================
+
+Submit feedback for developers
+------------------------------
+
+Do you like py.test?  Share some love on Twitter or in your blog posts!
+
+We'd also like to hear about your propositions and suggestions.  Feel free to
+submit them as issues `here <https://bitbucket.org/hpk42/pytest/issues>`__ and:
+
+* Set the "kind" to "enhancement" or "proposal" so that we can quickly find
+  about them.
+* Explain in detail how they should work.
+* Keep the scope as narrow as possible.  This will make it easier to implement.
+* If you have required skills and/or knowledge, you can always contribute to
+  these issues!
+
+Report bugs
+-----------
+
+Report bugs at https://bitbucket.org/hpk42/pytest/issues.
+
+If you are reporting a bug, please include:
+
+* Your operating system name and version.
+* Any details about your local setup that might be helpful in troubleshooting,
+  specifically Python interpreter version,
+  installed libraries and py.test version.
+* Detailed steps to reproduce the bug.
+
+Fix bugs
+--------
+
+Look through the BitBucket issues for bugs.  Here is sample filter you can use:
+https://bitbucket.org/hpk42/pytest/issues?status=new&status=open&kind=bug
+
+:ref:'Talk <contact>' to developers to find out how you can fix specific bugs.
+
+Implement features
+------------------
+
+Look through the BitBucket issues for enhancements.  Here is sample filter you
+can use:
+https://bitbucket.org/hpk42/pytest/issues?status=new&status=open&kind=enhancement
+
+:ref:'Talk <contact>' to developers to find out how you can implement specific
+features.
+
+Write documentation
+-------------------
+
+py.test could always use more documentation.  What exactly is needed?
+
+* More complementary documentation.  Have you perhaps found something unclear?
+* Documentation translations.  We currently have English and Japanese versions.
+* Docstrings.  There's never too much of them.
+* Blog posts, articles and such -- they're all very appreciated.
+
+Getting started for contributing
+================================
+
+1. Fork the py.test repository on BitBucket.
+.. _checkout:
+2. Clone your fork locally::
+
+    $ hg clone ssh://hg@bitbucket.org/your_name_here/pytest
+
+3. Install your local copy into a virtualenv.  Assuming you have
+   ``virtualenvwrapper`` (http://virtualenvwrapper.readthedocs.org) installed::
+
+    $ mkvirtualenv pytest
+    $ cd pytest/
+    $ python setup.py develop
+
+   If that last command complains about not finding the required version
+   of "py" then you need to use the development pypi repository::
+
+    $ python setup.py develop -i http://pypi.testrun.org
+
+4. Create a branch for local development::
+
+    $ hg branch name-of-your-bugfix-or-feature
+
+   Now you can make your changes locally.
+
+5. When you're done making changes, check that all of them pass all the tests
+   (including PEP8 and different Python interpreter versions).  It's as simple
+   as issuing this one command::
+
+    $ tox
+
+  The least minimum of required Python tests to pass is Python 2.7 and
+  Python 3.3::
+
+    $ tox -e py27,py33
+
+  If you don't seem to have ``tox`` installed, issue this from inside your
+  virtualenv::
+
+    $ pip install tox
+
+  You also need to have Python 3.3 and 2.7 available in your system.
+
+6. Commit your changes and push your branch to BitBucket::
+
+    $ hg add .
+    $ hg commit
+    $ hg push --new-branch -r .
+
+7. Submit a pull request through the BitBucket website.
+
+.. include:: links.inc