fixed #686: set z tag of appended tile

cocos2dx/tileMap_parallax_nodes/CCTMXLayer.cpp

@@ -381,6 +381,10 @@ namespace cocos2d {
 		// append should be after addQuadFromSprite since it modifies the quantity values
 		ccCArrayInsertValueAtIndex(m_pAtlasIndexArray, (void*)z, indexForZ);
 
+		// set z tag
+		addSpriteWithoutQuad(m_pReusedTile, indexForZ, z);
+		m_pReusedTile->release();
+
 		return m_pReusedTile;
 	}