add SendSuccess helper
Merge pull request #20 from dustismo/feature/helpers

Add send success helper function
better logging, double check connection before we replace it
close the listener
fix maxinflight naming.  part of the problem #19
work on goroutine saftey
more goroutine safety
comment
update how max inflight waiting works (no busy waiting)
Merge pull request #21 from dustismo/hotfix/client

work on fixes for client