Rama postgres

Fusión rama postgres con rama3

src/main/java/es/uva/inf/tfg/ginquin/smellswisdom/controller/AuthenticationInit.java

+package es.uva.inf.tfg.ginquin.smellswisdom.controller;
+
+import java.util.Map;
+
+import org.zkoss.zk.ui.Executions;
+import org.zkoss.zk.ui.Page;
+import org.zkoss.zk.ui.util.Initiator;
+
+public class AuthenticationInit implements Initiator {
+
+	@Override
+	public void doInit(Page page, Map<String, Object> args) throws Exception {
+		
+		if(Executions.getCurrent().getUserPrincipal()==null){
+			Executions.sendRedirect("/login.zul");
+		}
+	}
+
+}