Support CLUSTER SLOTS command

* CLUSTER SLOTS returns a Redis-formatted mapping from slot ranges to IP/Port pairs serving that slot range
* description link including output format
** e14829de30
* Unit test included

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

@@ -1011,4 +1011,8 @@ public void clusterSetSlotStable(final int slot) {
     public void clusterFailover() {
 	cluster(Protocol.CLUSTER_FAILOVER);
     }
+    
+    public void clusterSlots() {
+	cluster(Protocol.CLUSTER_SLOTS);
+    }
 }

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

@@ -38,4 +38,6 @@ public interface ClusterCommands {
     List<String> clusterSlaves(final String nodeId);
     
     String clusterFailover();
+    
+    List<Object> clusterSlots();
 }

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

@@ -3489,6 +3489,13 @@ public class Jedis extends BinaryJedis implements JedisCommands,
 	client.clusterFailover();
 	return client.getStatusCodeReply();
     }
+    
+    @Override
+    public List<Object> clusterSlots() {
+	checkIsInMulti();
+	client.clusterSlots();
+	return client.getObjectMultiBulkReply();
+    }
 
     public String asking() {
 	checkIsInMulti();

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

@@ -59,6 +59,7 @@ public final class Protocol {
     public static final String CLUSTER_REPLICATE = "replicate";
     public static final String CLUSTER_SLAVES = "slaves";
     public static final String CLUSTER_FAILOVER = "failover";
+    public static final String CLUSTER_SLOTS = "slots";
     public static final String PUBSUB_CHANNELS= "channels";
     public static final String PUBSUB_NUMSUB = "numsub";
     public static final String PUBSUB_NUM_PAT = "numpat";