#64 - Extended support for PagedResources.

Changed Relation type to identify previous links to standardized value of prev. Added integration tests for HAL rendering of PagedResources.

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

@@ -87,6 +87,16 @@ public class Links implements Iterable<Link> {
 		return result;
 	}
 
+	/**
+	 * Returns whether the {@link Links} container contains a {@link Link} with the given rel.
+	 * 
+	 * @param rel
+	 * @return
+	 */
+	public boolean hasLink(String rel) {
+		return getLink(rel) != null;
+	}
+
 	/**
 	 * Creates a {@link Links} instance from the given RFC5988-compatible link format.
 	 * 
@@ -114,6 +124,15 @@ public class Links implements Iterable<Link> {
 		return new Links(links);
 	}
 
+	/**
+	 * Returns whether the {@link Links} containter is empty.
+	 * 
+	 * @return
+	 */
+	public boolean isEmpty() {
+		return links.isEmpty();
+	}
+
 	/*
 	 * (non-Javadoc)
 	 * @see java.lang.Object#toString()