Added bitcount to standard interfaces and bitop to MultiKey interfaces (since it is non-shardable)

Merge branch 'impl-bitcount-and-bitop' of git://github.com/koron/jedis

Conflicts:
	src/main/java/redis/clients/jedis/JedisCommands.java

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

@@ -212,4 +212,8 @@ public interface BinaryRedisPipeline {
     Response<Long> zrevrank(byte[] key, byte[] member);
 
     Response<Double> zscore(byte[] key, byte[] member);
+
+    Response<Long> bitcount(byte[] key);
+
+    Response<Long> bitcount(byte[] key, long start, long end);
 }