Enhancements of Resource abstraction.

Introduced Resource and Resources value objects. The former captures single entity instances but adds links to it. The latter does the same for a collection of entities. Added SPI interfaces ResourcePostProcessor and ResourcesPostProcessor to allow manipulating Resource and Resources instances.

pom.xml

@@ -58,6 +58,7 @@
 
 	<properties>
 		<spring.version>3.1.2.RELEASE</spring.version>
+		<jackson.version>1.9.7</jackson.version>
 		<bundlor.failOnWarnings>true</bundlor.failOnWarnings>
 	</properties>
 
@@ -73,12 +74,20 @@
 			<artifactId>spring-webmvc</artifactId>
 			<version>${spring.version}</version>
 		</dependency>
+		
 		<dependency>
 			<groupId>javax.servlet</groupId>
 			<artifactId>servlet-api</artifactId>
 			<version>2.5</version>
 			<scope>provided</scope>
 		</dependency>
+		
+		<dependency>
+			<groupId>org.codehaus.jackson</groupId>
+			<artifactId>jackson-core-asl</artifactId>
+			<version>${jackson.version}</version>
+			<optional>true</optional>
+		</dependency>
 
 		<dependency>
 			<groupId>org.hamcrest</groupId>