Support for custom version with just specifying major and minor version

[PeterStaev]

It would be great if we can specify a custom version by just specifying major and minor versions. Right now all the version numbers seem to be required. In most of the cases where I want to use a specific version would be when I want to use a previous stable version. So it does not matter the revision number that is used as there shouldn't be any breaking changes between revisions.