Polished Resources abstraction.

Added correct equals(…)/hashCode() methods to PagedResource, PageMetadata. Polished toString() methods of ResourceSupport, Resource, Resources and PagedResources. Added factory method to PagedResources to easily create a plain instance from a set of entities.

src/main/java/org/springframework/hateoas/Resource.java

@@ -17,6 +17,8 @@ package org.springframework.hateoas;
 
 import java.util.Arrays;
 
+import javax.xml.bind.annotation.XmlRootElement;
+
 import org.codehaus.jackson.annotate.JsonUnwrapped;
 import org.springframework.util.Assert;
 
@@ -25,6 +27,7 @@ import org.springframework.util.Assert;
  * 
  * @author Oliver Gierke
  */
+@XmlRootElement
 public class Resource<T> extends ResourceSupport {
 
 	@JsonUnwrapped
@@ -59,6 +62,15 @@ public class Resource<T> extends ResourceSupport {
 		return content;
 	}
 
+	/* 
+	 * (non-Javadoc)
+	 * @see org.springframework.hateoas.ResourceSupport#toString()
+	 */
+	@Override
+	public String toString() {
+		return String.format("Resource { content: %s, %s }", getContent(), super.toString());
+	}
+
 	/* 
 	 * (non-Javadoc)
 	 * @see org.springframework.hateoas.ResourceSupport#equals(java.lang.Object)