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/RedisPipeline.java

@@ -188,4 +188,8 @@ public interface RedisPipeline {
     Response<Long> bitcount(String key);
 
     Response<Long> bitcount(String key, long start, long end);
+    
+    Response<Long> pfadd(final String key, final String... elements);
+    
+    Response<Long> pfcount(final String key);
 }