autodocstring: complete docstring as you type

[humitos]

• http://emacs.stackexchange.com/questions/19422/library-for-automatically-inserting-python-docstring-in-google-style
• https://www.emacswiki.org/emacs/auto-document.el
• http://tiborsimko.org/emacs-epydoc-snippets.html

[humitos]

I'm using sphinx-doc.el but it seems that it has a bug that really bother us because our way of documenting: https://github.com/naiquevin/sphinx-doc.el/issues/16