Fix Redis cache auto-configuration

Add an explicit link to the `RedisAutoConfiguration` to make sure it is
applied before the cache counter-part. Request the general
`redisTemplate` so that non String-values can be handled by default as
well.

See gh-2633

spring-boot-autoconfigure/src/main/java/org/springframework/boot/autoconfigure/redis/RedisAutoConfiguration.java

 /*
- * Copyright 2012-2014 the original author or authors.
+ * Copyright 2012-2015 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.
@@ -178,7 +178,7 @@ public class RedisAutoConfiguration {
 
 		@Bean
 		@ConditionalOnMissingBean(name = "redisTemplate")
-		public RedisOperations<Object, Object> redisTemplate(
+		public RedisTemplate<Object, Object> redisTemplate(
 				RedisConnectionFactory redisConnectionFactory)
 				throws UnknownHostException {
 			RedisTemplate<Object, Object> template = new RedisTemplate<Object, Object>();