JBPM-4314,DROOLS-192 Remove 4.x legacy API
Removing unused dom4j dependencies because they can cause classloading problems.
JBPM-4320: Persistent meta-data in BPMN2 process
 - adding some additional commands
 - add missing task audit class in persistence.xml
 - update to dashboard url in installer
 - adding task audit classes in installer persistence.xml
- fixing support for stop/fail/exit audit task