- cleaned up shutdown logic for outbound sender [#205](https://github.com/xmidt-org/caduceus/pull/205)
- added resetting queue depth and current workers gauges to outbound sender [#205](https://github.com/xmidt-org/caduceus/pull/205)
- removed queueEmpty variable from outbound sender [#209](https://github.com/xmidt-org/caduceus/pull/209)
- fixed outbound sender's long running dispatcher() goroutine to not exit when a cutoff occurs [#210](https://github.com/xmidt-org/caduceus/pull/210)
- register for specific OS signals [#211](https://github.com/xmidt-org/caduceus/pull/211)
