Fix a bug that the Subscription couldn't retry because there was not any object referenced to the created Timer
  https://github.com/vanthoainguyen/Burrow.NET/issues/14
Merge branch 'master' of github.com:vanthoainguyen/Burrow.NET
Fix a bug that the Subscription couldn't retry because there was not any object referenced to the created Timer
  https://github.com/vanthoainguyen/Burrow.NET/issues/14