DATAREDIS-296 - Upgrade jedis to recent version.

Upgrading to latest jedis version 2.5.1. Added new conversion for Long to byte[] in JedisConverters to be able to convert long cursorIds to byte[].

Original pull request: #77.

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

@@ -2975,11 +2975,8 @@ public class JedisConnection implements RedisConnection {
 
 				ScanParams params = prepareScanParams(options);
 
-				// TODO: use binary version of jedis.sscan (in v.2.4.3) to avoid potentially invalid representations.
-				redis.clients.jedis.ScanResult<String> result = jedis.sscan(JedisConverters.toString(key),
-						Long.toString(cursorId), params);
-				return new ScanIteration<byte[]>(Long.valueOf(result.getStringCursor()), JedisConverters.stringListToByteList()
-						.convert(result.getResult()));
+				redis.clients.jedis.ScanResult<byte[]> result = jedis.sscan(key, JedisConverters.toBytes(cursorId), params);
+				return new ScanIteration<byte[]>(Long.valueOf(result.getStringCursor()), result.getResult());
 			}
 		}.open();
 	}

src/main/java/org/springframework/data/redis/connection/jedis/JedisConverters.java

@@ -48,6 +48,7 @@ import redis.clients.util.SafeEncoder;
  * 
  * @author Jennifer Hickey
  * @author Christoph Strobl
+ * @author Thomas Darimont
  */
 abstract public class JedisConverters extends Converters {
 
@@ -117,6 +118,10 @@ abstract public class JedisConverters extends Converters {
 		return String.valueOf(source).getBytes();
 	}
 
+	public static byte[] toBytes(Long source) {
+		return String.valueOf(source).getBytes();
+	}
+
 	public static String toString(byte[] source) {
 		return source == null ? null : SafeEncoder.encode(source);
 	}