MyJsr250Destroyer should LOG instead of swallow and silently ignore Exception on close

[vorburger]

This, where MyJsr250Destroyer just "swallows" (silently ignores) any Exception from @PreDestroy annotated methods, isn't great IMHO... it would be better if it would at least LOG.warn() such issues?

I suspect that you may be reluctant to make mycila/guice dependant on any particular logging framework, but I would argue that slf4j-api is meanwhile a nearly universally accepted logging API, with binding bridges to many others, and thus totally acceptable as a dependency.

Would a PR with this be welcome?