Springified the logging service

So I deleted some useless classes since the LOG4J string was being passed in explicitly via the spring XML (thus negating the purpose of having an enum) and the LoggingConfigurationFacade only had logic to deal with LOG4J.

There is something sketchy here, though. It doesn't seem like the LoggingService is a service at all; the only method present in the LoggingService interface is updateLoggingConfiguration which is only called from within an inner class configuration listener after the refactor. I guess this is something we can look at later?