#482 - Add support for Collection+JSON mediatype.

Introduce support for media type application/vnd.collection+json. Collection+JSON doesn't allow metadata at the top, so paging data can't be covered, however, everything else fits.

Also moved a little bit more into Affordance and SpringMvcAffordance to avoid using Spring MVC annotations directly in a given mediatype's AffordanceModel.

Refactored bits of HAL-FORMS to reuse the new PropertyUtils, ensuring Jackson ignore annotations are taken into consideration. Also added MockMVC tests to show HAL-FORMS and Collection+JSON working together, against the same controller.

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

@@ -49,7 +49,7 @@ import com.fasterxml.jackson.annotation.JsonInclude;
  */
 @XmlType(name = "link", namespace = Link.ATOM_NAMESPACE)
 @JsonInclude(JsonInclude.Include.NON_NULL)
-@JsonIgnoreProperties("templated")
+@JsonIgnoreProperties(value = "templated", ignoreUnknown = true)
 @AllArgsConstructor(access = AccessLevel.PACKAGE)
 @Getter
 @EqualsAndHashCode(of = { "rel", "href", "hreflang", "media", "title", "deprecation", "affordances" })