1.0.0a3

This is the third alpha milestone tag for ara 1.0.

Main changes:
- The code and git repositories for ara-server, ara-clients and
ara-plugins have been merged back into the feature/1.0 branch of ara [1].
- Documentation for ARA 1.0 is live on readthedocs [2]
- There is a new built-in Ansible role for deploying the API server [3]
- There is a new built-in Ansible role for deploying the web client [4]

[1]: https://github.com/openstack/ara/tree/feature/1.0
[2]: https://ara.readthedocs.io/en/feature-1.0/
[3]: https://ara.readthedocs.io/en/feature-1.0/ansible-role-ara-api.html
[4]: https://ara.readthedocs.io/en/feature-1.0/ansible-role-ara-web.html