Fix Scale TaskLogging

Scale Task might crash due do (currently not logged exceptions)
Log output of Colosseum Client and Jeasy Workflow Engine is missing
fix logging to investigate in exception by:
add logger to colosseum client by colosseum client builder
add dependency of https://mvnrepository.com/artifact/org.slf4j/jul-to-slf4j in a compatible version to maven dependencies which bridges the java util logger to slf4j
slf4j facades might also help
configure logback.xml to log into a file

Edited Oct 22, 2018 by Daniel Seybold

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