Improving the evaluation implementation in server
	modified:   src/main/java/br/ufrn/dimap/pubnote/dao/EvaluationDAO.java
	modified:   src/main/java/br/ufrn/dimap/pubnote/domain/EvaluationEntity.java
	modified:   src/main/java/br/ufrn/dimap/pubnote/ws/EvaluationService.java