Upgrade to Hibernate ORM 5.0 RC1 and Hibernate Validator 5.2 RC1

Includes other recent dependency updates (JRuby 1.7.20, Jetty 9.2.11, Tomcat 8.0.23, Reactor 2.0.3)

Issue: SPR-13088

spring-context/src/main/java/org/springframework/scripting/jruby/JRubyScriptUtils.java

@@ -1,5 +1,5 @@
 /*
- * Copyright 2002-2014 the original author or authors.
+ * Copyright 2002-2015 the original author or authors.
  *
  * Licensed under the Apache License, Version 2.0 (the "License");
  * you may not use this file except in compliance with the License.
@@ -95,6 +95,7 @@ public abstract class JRubyScriptUtils {
 	/**
 	 * Initializes an instance of the {@link org.jruby.Ruby} runtime.
 	 */
+	@SuppressWarnings("unchecked")
 	private static Ruby initializeRuntime() {
 		return JavaEmbedUtils.initialize(Collections.EMPTY_LIST);
 	}