Fixed package name error in log4j.properties, changed logging level for loaders to WARN.
Fixed package name error in log4j.properties, changed logging level for loaders to WARN.

ppavlidis/Gemma,ppavlidis/Gemma,ppavlidis/Gemma,ppavlidis/Gemma,ppavlidis/Gemma,ppavlidis/Gemma,ppavlidis/Gemma