Ignore books in JSON output; define SQL fetch & cascade types for book

list
Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

bookstore/src/main/java/com/fjordtek/bookstore/model/Category.java

@@ -30,7 +30,7 @@ public class Category {
 			sequenceName = "categoryIdSequence"
 			)
 	@JsonIgnore
-    private Long id;
+	private Long id;
 
 	////////////////////
 	// Attributes with hard-coded constraints