Add release notes for Review Board 2.5.4.
Review Request #8119 — Created April 12, 2016 and submitted
This contains all the bug fixes and new features introduced since 2.5.3.
It also adds missing names to the AUTHORS.
Built the docs and checked through them.
Tool: PEP8 Style Checker Ignored Files: docs/releasenotes/index.rst docs/releasenotes/2.5.4.rst AUTHORS Tool: Pyflakes Ignored Files: docs/releasenotes/index.rst docs/releasenotes/2.5.4.rst AUTHORS