Updated Logger to use SL4J with Log4J.
Merge branch 'sprint1' of https://github.com/kinmengBGM/bgm-hrm into
sprint1

Conflicts:
	leaveapp/web/src/main/webapp/WEB-INF/commons-logging.properties
	leaveapp/web/src/main/webapp/WEB-INF/log/log4j.properties