JBPM-3869, BZ-880874: Pessimistic locking support
JBPM-3869, BZ-880874: Testing pessimistic locking
JBPM-4066 - Fix/improve tests for ht deadlines, timer and runtime manager that fails randomly on jenkins
 - adding cause exception
Merge branch 'master' of git://github.com/droolsjbpm/jbpm
first draft at adding kjar dependencies