Modify SlotDeliveryWorker to save queue list in a ConcurrentSkipListSet.
Merge pull request #101 from akalankapagoda/concModf

Modify SlotDeliveryWorker to save queue list in a ConcurrentSkipListSet.
performance optimizations for write speed and fix to recover thread exceeding issue with a configured wait
Merge pull request #103 from hastef88/performance_optimization

performance optimizations for write speed and fix to recover thread exce...