The Python3 dev doc is more general than just modules
* Rename it to make that obvious.
* Move generally applicable Python3 information to the Controller section
* Add a Py3/Py2 section on formatting strings
* Fix code-blocks to highlight as python
* Enhance python3 support page
* Add Python3/Python2 compat note
* WIP Partners guide for adding multiple modules
* WIP
* WIP
* WIP
* WIP
* WIP
* HACK
* Revert hack
* Brian's feedback
* Remove squash notes
* Minor tidyups
* Unit & Integration tests (& minor tweaks)
* Details about Unit tests
* As we are about to feature freeze on Ansible 2.3 remove the notes about Ansible 2.4 and py2.4.
* Module names should be in the singular
* Scot & Dylan's feedback
* 5 PRs at once. Remove FIXMEs
* Formatting
* How to use Git & GitHub
* directories are in category & topic
* Expectations of Module authors
* Better wording for module author's responsibilities