Support Sorted Set with LEX commands

* new commands : ZLEXCOUNT, ZRANGEBYLEX, ZREMRANGEBYLEX
** added commands to Jedis, ShardedJedis, JedisCluster, PipelineBase with Binary
/ Normal(String)
** description links
*** http://redis.io/commands/zlexcount
*** http://redis.io/commands/zrangebylex
*** http://redis.io/commands/zremrangebylex
** Unit test included

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

@@ -506,6 +506,27 @@ public class ShardedJedis extends BinaryShardedJedis implements JedisCommands {
 	Jedis j = getShard(key);
 	return j.zremrangeByScore(key, start, end);
     }
+    
+    @Override
+    public Long zlexcount(final String key, final String min, final String max) {
+	return getShard(key).zlexcount(key, min, max);
+    }
+
+    @Override
+    public Set<String> zrangeByLex(final String key, final String min, final String max) {
+	return getShard(key).zrangeByLex(key, min, max);
+    }
+
+    @Override
+    public Set<String> zrangeByLex(final String key, final String min, final String max,
+	    final int offset, final int count) {
+	return getShard(key).zrangeByLex(key, min, max, offset, count);
+    }
+
+    @Override
+    public Long zremrangeByLex(final String key, final String min, final String max) {
+	return getShard(key).zremrangeByLex(key, min, max);
+    }
 
     public Long linsert(String key, LIST_POSITION where, String pivot,
 	    String value) {
@@ -570,4 +591,5 @@ public class ShardedJedis extends BinaryShardedJedis implements JedisCommands {
 	Jedis j = getShard(key);
 	return j.zscan(key, cursor);
     }
+    
 }