1.1.10 breaks use of third party outputters

[wr0ngway]

My log4r-gelf outputter stopped working with 1.1.10. Log4r is now only looking for types defined directly in Log4r namespace, but anything deeper fails to be resolved, e.g. Log4r::Gelf::GelfOutputter. This worked in 1.1.9. I can change the class name, but maybe this should be more permissive

https://github.com/colbygk/log4r/commit/d052fcd587d33ba8c9de41437701eb3d28593873