Add support for redis cluster hashtags

src/main/java/redis/clients/util/JedisClusterCRC16.java

@@ -3,8 +3,20 @@ package redis.clients.util;
 public class JedisClusterCRC16 {
     public final static int polynomial = 0x1021; // Represents x^16+x^12+x^5+1
     static int crc;
+    
 
     public static int getSlot(String key) {
+	int s = key.indexOf("{");
+	if (s > -1) {
+	    int e = key.indexOf("}", s+1);
+	    if (e > -1 && e != s+1) {
+		key = key.substring(s+1, e);
+	    }
+	}
+	return getCRC16(key) % 16384;
+    }
+
+    private static int getCRC16(String key) {
 	crc = 0x0000;
 	for (byte b : key.getBytes()) {
 	    for (int i = 0; i < 8; i++) {
@@ -18,6 +30,6 @@ public class JedisClusterCRC16 {
 	    }
 	}
 
-	return crc &= 0xffff % 16384;
+	return crc &= 0xffff ;
     }
 }