Specify jenkinscli version. Add dryrun functionality.
Implement Issue #1:
be able to specify dry-run and source/target branch explictly
-t reaktor-1.35 -s andreas.martin-1.35 => andreas.martin-1.35 -> reaktor-1.35
-t reaktor-1.35 -s feature => feature -> reaktor-1.35
-t dev -s elasticSearch => elasticSearch -> dev
-d => dry-run