Add travis

[ktoso]

I don't have admin rights in this repo so can't do it.
Admin me or please add travis :)

[ktoso]

I added the file already, but needs enabling on travis-ci.org

https://github.com/typesafehub/sbt-java-formatter/blob/master/.travis.yml

[henrikengstrom]

@ktoso Added you as admin, so now you can do your thing :)

[ktoso]

Excellent, this is how I like to roll. 😎