Upgrade plugins and common dependencies (akka#2000)

* Plugin upgrades
* Update common dependencies and test dependencies
* Reformatted Java code
* Tests run on JDK 11
* Jackson: depend directly on jackson-core

Jackson Databind 2.9.10 (akka#1980)

Release notes for 1.1.1 (akka#1867)

Release notes for 1.1.1

Adapt to Akka 2.6 API updates (akka#1806)

Release notes 1.0.2 (akka#1737)

Small fix in release notes

Use same request timestamp for dates in signing

Ignore all modules but S3

Merge pull request akka#1634 from 2m/wip-guava-scaldoc-2m

Ignore the latest guava android from the dependencies

Release notes 1.0-RC1 (akka#1586)

Refs akka#1580