Clean up the specfiles and docs, and get rid of the discovery image RPM.
Add helper script for making our RPMs in a Docker container.
Zap mostly unused %doc stanzas
Clean up make-ocb-rpms.sh

This removes some hardcoded assumptions, and makes the flow through
generating our rpms a little easier to follow.
Clean up make-ruby-rpm.sh to work in the context of a Docker container.
Fix up generating Ruby packages
Update README.md.
Merge pull request #20 from VictorLowther/dockerize-rpm-build-process

+2 Dockerize rpm build process