Logging: moved logging config to a separate file and ensured it is only configured when running WireMock as an application (either standalone or in a war)
Ensured log4j is not namespaced as logging works better that way
Added test project that proves WireMock can then be used when sending Log4j to SLF4J
Added ability to inject a custom notifier into WireMockServer, default remains Log4j
Initial merge of Rob's logging changes