Support configuration via HOCON

[jokade]

Support logging configuration using HOCON (Typesafe config of shocon)

[Andrei-Pozolotin]

+1

[ekrich]

This is possible right now on the JVM as a pure Scala lib, just waiting for Scala Native 0.3.9 release for Native support - https://github.com/ekrich/sconfig Will support Scala.js after that.