v0.2.4

v0.2.4

• support input/output for service task and user task (#2)
  • breaking change: ActivatedJob type is no more using fields, but only function interface
• support for user tasks (BPMN) (#32)
• document how to use timers (#37)
• support adding variables along with publishing messages (#41)
  • breaking change in method signature: PublishEventForInstance(processInstanceKey int64, messageName string, variables map[string]interface{}) now requires a variable parameter
• fix two issues with not finding/handling the correct messages (#31)