Option to promote to "next version".

[dustinmhorvath]

At a glance, this looks like a pretty solid project. I'm trying to look through the roles a bit to see how easy it'd be to get the "next" version and promote an environment to that. In our environment, we have a test version, and a production environment that lags a couple of versions behind. I suppose it'd be a matter of getting the current version for the environment, and attempting to promote to current_version+1, as opposed to "last".

I think this would go a long way to solving the issue of "promote to a specific version" without having to do the nitty gritty of targeting explicit version numbers, it would instead be a promotion relative to its current version.

I'll likely continue to look through these roles and see what I can suss out.