OSS suite has a versioning explanation and policy

[Alex Kalish]

After significant work and debate, we arrived at a versioning policy for the Conjur OSS Suite that is directly dependent upon the the Conjur version included in the release. Essentially, it will be x.y.z+suite.n, where x.y.z is the Conjur version and n is an integer incremented for each suite release using the same Conjur version. The latter component will likely not be incremented often. This is a fairly straightforward and easy to understand scheme, but it still needs to be communicated to both user and contributors of this repo. With that in mind, I would suggest addition of the following:

1. Add a small section to the README explaining what our versions mean and how they relate to Conjur. This is only intended for users.
2. Add larger section to the CONTRIBUTING file explaining how a version number is determined, so that contributors conducting releases can decide which version to use for each release.
3. File a separate issue so that the content in first todo/bullet above is also added to the docs.conjur.org site. This will ensure that users understand our versioning, regardless of how they consume the suite.
4. (Optional) As said above, significant thought was put into this scheme. I think there is value in publishing this in a public place. Maybe we need a designs directory or it could go into the wiki.

[Geri Jennings]

Filed cyberark/conjur-docs#890