Swagger2 Upgrade

This upgrade has kork-swagger making use of the springfox.io artifacts.

Swagger is now accessible under /swagger-ui.html.

finalize Travis release

Merge pull request #21 from cfieber/publish_snapshots

re-enable snapshot publishing now that we are synced to jcenter

Travis release

Testing travis CI release automation, and releasing a build that only has travis CI build related changes!