fixed queue testing for more strictly.
throw excepthon when force killed.
added hooks for task_start,task_finish,task_abort.
use Log::Minimal
should be logging always.
added DequeueAbort Exception.
rethrow when caught not dequeue abort exception in dequeue.
fixed spelling
suppress stderr in testing.
move register_tasks after enqueue
should return or timeout when queue is empty in dequeue process.
added verbose mode for Workman::Test::Queue for debugging.