11 - provide some extra config for configuration of appenders for loggers
14 - what about loggingPrefix?
15 - provide API for setting appenders
17 NSObject+ExtendedLogging:
18 - should check if -loggingPrefix is defined. If YES should provide this to
22 - should remember its logger? -> probably important for filtering
28 - We're probably not interested in providing lots of appenders for lots of
29 different loggers. Most of the time we have something like a default
30 appender, say NGLogConsoleAppender during development and NGLogSyslogAppender
31 for deployment (or file appenders)