#667 - Ignore unknown properties in LinkMixin.

In HAL-based documents (HAL and HAL-FORMS), the "templated" property must be ignored in LinkMixin, because that's where it is applied. Removes the need for a no-op `setTemplated` method in Link.

* Test cases drafted for both HAL an HAL-FORMS to verify proper behavior.
* Jackson2HalFormsIntegrationTest migrated from Hamcrest to AssertJ assertions.

Related pull requests: #668

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

@@ -221,18 +221,6 @@ public class Link implements Serializable {
 		return !getUriTemplate().getVariables().isEmpty();
 	}
 
-	/**
-	 * This no-op setter is required to deserialize a link that contains a templated URL. It allows Jackson to
-	 * "set" the property, but since {@code templated} is a virtual property, the injected value {@code true} or
-	 * {@code false) is ignored.
-	 *
-	 * The method is kept private so no one attempts to actually use it.
-	 *
-	 * @param __ - don't care what value is passed in. The true value {@link #isTemplated()} is based upon the {@link UriTemplate}.
-	 */
-	private void setTemplated(boolean __) {
-	}
-
 	/**
 	 * Turns the current template into a {@link Link} by expanding it using the given parameters.
 	 * 

src/main/java/org/springframework/hateoas/hal/LinkMixin.java

@@ -30,7 +30,7 @@ import com.fasterxml.jackson.databind.annotation.JsonSerialize;
  * @author Oliver Gierke
  * @author Greg Turnquist
  */
-@JsonIgnoreProperties({ "rel", "media", "affordances", "template" })
+@JsonIgnoreProperties(value = { "rel", "media", "affordances", "template" }, ignoreUnknown = true)
 public abstract class LinkMixin extends Link {
 
 	private static final long serialVersionUID = 4720588561299667409L;