Add support to Redis Streams using Jedis.

Closes #1711
Original pull request: #1977.

Author: dengliming

Diff for: src/main/java/org/springframework/data/redis/connection/jedis/JedisConnection.java

@@ -189,7 +189,7 @@ public RedisKeyCommands keyCommands() {
 	 */
 	@Override
 	public RedisStreamCommands streamCommands() {
-		throw new UnsupportedOperationException("Streams not supported using Jedis!");
+		return new JedisStreamCommands(this);
 	}
 
 	/*