enable findbugs plugin and fix all warnings
Fail request with exception if no configuration matches
fix: place data, logs and work in subdirs of tmp dir
cleanup: added access modified 'protected'
logging: show which configurations matched
cleanup: removed unused code
cleanup: every exception should extend from DegraphmalizerException
raise exception when conf dir cannot be found, fixed some formatting
unit test for configuration merging
fix: it's the other way around :-S
cleanup: adjust elasticsearch log level in unit tests