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/MultiKeyCommands.java

@@ -68,4 +68,6 @@ public interface MultiKeyCommands {
     void psubscribe(JedisPubSub jedisPubSub, String... patterns);
 
     String randomKey();
+
+    Long bitop(BitOP op, final String destKey, String... srcKeys);
 }