Added check for duplicate department name
Merge branch 'master' of https://github.com/SnailArk/SnailHRM.git

Conflicts:
	SnailHRM/src/com/snailark/snailhrm/ExceptionCategory.java
	SnailHRM/src/com/snailark/snailhrm/dao/DataAccessObject.java
	SnailHRM/src/com/snailark/snailhrm/dao/DepartmentDAO.java
	SnailHRM/src/com/snailark/snailhrm/facade/ConfigurationFacade.java
	SnailHRM/src/com/snailark/snailhrm/service/ConfigurationService.java
	SnailHRM/src/struts.xml