Launch 3 nodes on ports 7379 to 7381 with cluster enabled.

Add command CLUSTER NODES

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

@@ -807,4 +807,12 @@ public class Client extends BinaryClient implements Commands {
     public void hincrByFloat(final String key, final String field, double increment) {
     	hincrByFloat(SafeEncoder.encode(key), SafeEncoder.encode(field), increment);
     }
+
+    public void cluster(final String... args) {
+	final byte[][] arg = new byte[args.length][];
+	for (int i = 0; i < arg.length; i++) {
+	    arg[i] = SafeEncoder.encode(args[i]);
+	}
+	cluster(arg);
+    }
 }