adapt doc directory tree structure

doc/contributors/documentation.rst

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+
+
+Documentation
+=============
+
+This documentation is refreshed upon each push to the central repository.
+
+The module reference documentation is generated from the module sources using
+``#.rst:`` tags (compare for instance
+http://autocmake.readthedocs.org/en/latest/module-reference.html#cc-cmake with
+https://github.com/scisoft/autocmake/blob/master/modules/cc.cmake).

doc/contributors/guidelines.rst

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+
+
+Contributing guidelines
+=======================
+
+Please follow the excellent guide: http://www.contribution-guide.org.
+
+We do not require any formal copyright assignment or contributor license
+agreement. Any contributions intentionally sent upstream are presumed to be
+offered under terms of the OSI-approved BSD 3-clause License.

doc/contributors/testing.rst

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+
+
+Testing Autocmake
+=================
+
+You will need to install `pytest <http://pytest.org/>`__.
+Check also the `Travis build and test recipe <https://github.com/scisoft/autocmake/blob/master/.travis.yml>`__
+for other requirements.
+
+Your contributions and changes should preserve the test set. You can run it locally with::
+
+  $ py.test test/test.py
+
+This test set is run upon each push to the central repository.
+See also the `Travis build and test history <https://travis-ci.org/scisoft/autocmake/builds>`__.