Dropping FK before UK to avoid MySQL error 150

When I tryed to run the migration script I got error 150. 

To solve that I needed to remove ACT_FK_EXE_PROCDEF before ACT_UNIQ_RU_BUS_KEY.

[ACT-1844] ActivitiRule fails if test methods are declared in a super cl...

[ACT-1859] TaskListeners configured for ALL event types do not receive DELETE events

[FIX] ACT-1816: ManagementService doesn't seem to give actual table Name for EventSubscriptionEntity.class

ACT-1752

In BpmnDeployer, only schedule start timers AFTER process definition has
been persisted

Add taskService.complete() method that takes an option boolean to determine the scope of variables

Fix #160

use BusinessCalendarManager instead of create a new instance each time

Turkish translation of messages.properties