Apply PF* (string, binary) commands to Pipeline

* Apply PF* (string, binary) commands to Pipeline
* PF* Pipeline (string, binary) commands to interface
** pfadd / pfcount : BinaryRedisPipeline, RedisPipeline
** pfmerge : MultiKeyBinaryRedisPipeline, MultiKeyCommandsPipeline

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

@@ -65,4 +65,6 @@ public interface MultiKeyBinaryRedisPipeline {
     Response<byte[]> randomKeyBinary();
 
     Response<Long> bitop(BitOP op, final byte[] destKey, byte[]... srcKeys);
+    
+    Response<String> pfmerge(final byte[] destkey, final byte[]... sourcekeys);
 }