Build docstrings docs

[lambdamusic]

• https://www.datacamp.com/community/tutorials/docstrings-python#fourth-head
• http://www.sphinx-doc.org/en/master/usage/quickstart.html
• https://docs.python.org/2/library/pydoc.html

[lambdamusic]

See also https://github.com/readthedocs/sphinx_rtd_theme/blob/a3ab477aaa23f3b7ab7d62c7abc2cc74102ab2b8/docs/demo/test_py_module/test.py

[lambdamusic]

Done with v0.8