Rama postgres

Fusión rama postgres con rama3

src/main/resources/META-INF/persistence.xml

 <?xml version="1.0" encoding="UTF-8"?>
-<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
-   <persistence-unit name="jpaData" />
+<persistence xmlns="http://java.sun.com/xml/ns/persistence"
+	version="2.0">
+	<persistence-unit name="jpaData">
+		<provider>org.hibernate.ejb.HibernatePersistence</provider>
+		<properties>		
+			<property name="hibernate.temp.use_jdbc_metadata_defaults"
+				value="false" />
+				
+		     <property name="hibernate.dialect"
+                        value="org.hibernate.dialect.PostgreSQLDialect" />
+		</properties>
+	</persistence-unit>
 </persistence>