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/MultiKeyCommandsPipeline.java

@@ -62,4 +62,6 @@ public interface MultiKeyCommandsPipeline {
     Response<Long> publish(String channel, String message);
 
     Response<String> randomKey();
+
+    Response<Long> bitop(BitOP op, final String destKey, String... srcKeys);
 }