Update roadmap / split into ROADMAP.md with relevant information

[cdrage]

So a few things look out of date / completed in the road map within README.md.

I say we split this into ROADMAP.md and have a more up-to-date / future plan. Including listing all past "accomplishments".

[kadel]

Can we use just Issues and Milestones for roadmap and planing?

[cdrage]

@kadel One of my reasonings is in regards to being accepted into the Kubernetes repo. It was noted to have a clear roadmap for the future in regards to release / features / implementations.

So having a ROADMAP.md in the readme similar to: https://github.com/coreos/rkt/blob/master/ROADMAP.md (just an example)

[kadel]

So having a ROADMAP.md in the readme similar to: https://github.com/coreos/rkt/blob/master/ROADMAP.md (just an example)

ok, that looks good. It just links to Milestones I like that ;-)

[sebgoa]

I am going to close this in favor of #250 which talks about removing the roadmap items in the README.

So feel free to send a PR for this, I had said I would do it...

For the record, the simple bullet list roadmap was just to get a few ideas for the incubator proposal.