Add contributing file.

Change-Id: Icccca9a07a724c70bccb96cf6f97c8ff147af90f
Rename back to PBR.

Change-Id: I13ee7fab7858231b0fa17f9116176a09184e8b0e
Update documentation for release.

Change-Id: I215bfa00a836c7fafb535b78e6fef89c81e28817
Add MANIFEST.in.

Change-Id: I5c7b7ce3bbfa89e26179c1fc1b757d17c37e7394
Ensure that reuqirements files are shipped.

Change-Id: I4bf9c7d38e9d2ebd93b972c415a33d8d510b03ca
Make hacking compliant.

Change-Id: Ibbd091decfe377a43f691aaf26905edb40ff299f
Update tox to run hacking.

pbr can't depend on hacking, because hacking depends on pbr. But,
we can put it into the tox file.

Change-Id: I49d17917f79c167ae7df9bef3f59047e5c12d33e