Use Try::Tiny for proper preservation of $@ .

- Try::Tiny included in the service files
- Removed the use of $@
Change-Id: I0846e6a9cbb4266d4d78d7903415da33c8669db7
Merge branch 'master' of https://github.com/TrackingSoft/Redis-JobQueue

Change-Id: Ia4fc1a759d37560fac36269bc103026d2613f241