#1059 - Cleanup the core codebase.

Clean up code containing various patterns:

* Remove redundant `final`, `public`, and `static` declarations in interfaces and enums.
* Replace redundant `? extends Object` generic parameters with `?`.
* Convert collections to arrays using empty array instead of pre-sized one (modern JVM recommendation).
* Initialize collections using constructor call over `addAll`.
* Favor `addAll` over iterating and adding one-by-one.
* Take advantage of `Map.forEach` that was introduced with Java 8.

src/main/java/org/springframework/hateoas/client/Traverson.java

@@ -126,7 +126,7 @@ public class Traverson {
 		return DEFAULTS.getHttpMessageConverters(Arrays.asList(mediaTypes));
 	}
 
-	private static final RestOperations createDefaultTemplate(List<MediaType> mediaTypes) {
+	private static RestOperations createDefaultTemplate(List<MediaType> mediaTypes) {
 
 		RestTemplate template = new RestTemplate();
 		template.setMessageConverters(DEFAULTS.getHttpMessageConverters(mediaTypes));