1.0.0a4

This is the fourth alpha milestone tag for ARA 1.0.

Main changes:
- An API refactor has landed to return the right things in the right
context, bringing us closer to a stable API
- There is no longer a dedicated model and API for stats, they are now
part of the hosts API.
- The ara.setup.* python modules to help configure Ansible with ARA have
been ported from 0.x to 1.0.
- Integration tests have been made easier to run
- Improvements to documentation

You can find the full list of changes since 1.0.0a3 on GitHub:
https://github.com/ansible-community/ara/compare/1.0.0a3...1.0.0a4