add SCAN, HSCAN, SSCAN and ZSCAN

src/main/java/redis/clients/jedis/ShardedJedis.java

@@ -5,6 +5,7 @@ import redis.clients.util.Hashing;
 
 import java.util.List;
 import java.util.Map;
+import java.util.Map.Entry;
 import java.util.Set;
 import java.util.regex.Pattern;
 
@@ -522,5 +523,18 @@ public class ShardedJedis extends BinaryShardedJedis implements JedisCommands {
 	return j.bitcount(key, start, end);
     }
 
-
+    public ScanResult<Entry<String, String>> hscan(String key, int cursor) {
+	Jedis j = getShard(key);
+	return j.hscan(key, cursor);
+    }
+    
+    public ScanResult<String> sscan(String key, int cursor) {
+	Jedis j = getShard(key);
+	return j.sscan(key, cursor);
+    }
+    
+    public ScanResult<Tuple> zscan(String key, int cursor) {
+	Jedis j = getShard(key);
+	return j.zscan(key, cursor);
+    }
 }