Add JUL java.util.logging.config.class implementation to be able to easily use code-less SLF4JBridgeHandler initialization using JVM parameter 

-Djava.util.logging.config.class=org.slf4j.bridge.SLF4JBridgeHandler.Initializer

It adds org.slf4j.bridge.SLF4JBridgeHandler as root j.u.l Logger handler.

Removing need for java.util.logging.config.file and logging.properties which can't be taken from classpath and must be filesystem path.