akka/akka — pull request #1335 by rkuhn (2013-04-13 21:54:33+00:00)
Title: clean up DeathWatch semantics, see #3231

- DeathPactException => Stop in defaultStrategy
- ensure that after calling `context unwatch ref` we will not process a
Terminated(`ref`) anymore, even if it was already enqueued (i.e.
unwatch() happens between DeathWatchNotification and Terminated)