Publish to maven central

[sixcorners]

It would be nice if this was in maven central.

[vorburger]

Personally I love the current JitPack based set-up, and prefer it, because:

• you don't have to wait for "someone to do a release" - you can just use a Git rev
• you don't have to worry about who has the secret private key to PGP sign releases for maven central etc.