Add release notes for RBIntegrations 0.5 beta 1

Review Request #8853 — Created March 27, 2017 and submitted — Latest diff uploaded

Information

rbintegrations
master
234603d...

Reviewers

This patch adds support for creating release notes for RBIntegrations
through Sphinx. As such, it adds some new dependencies and quite a bit
of boiler plate along with the actual release notes for RBIntegrations
0.5 beta 1.

Built the docs and read through them.