Currently, the ContextDetachingSCL only supports detaching a ContextJNDISelector.

If some other ContextSelector implementation is used, it would be nice if the ContextDetachingSCL gracefully stopped logback as described in chapter 3 of the logback manual.

As a side effect, I think this type of implementation would provide the added benefit of gracefully stopping AsyncAppender instances instantiated as part of a web application context.

Attached is an updated ContextDetachingSCL implementation that detaches the default context if no context is found via a JNDI lookup.

Thoughts?