added cobblestone to the texture atlas

src/mapnode.cpp

@@ -347,6 +347,7 @@ void init_mapnode()
 	f->is_ground_content = true;
 	f->dug_item = std::string("MaterialItem ")+itos(i)+" 1";
 	
+	// NOTE: Remember to add frequently used stuff to the texture atlas in tile.cpp
 }
 
 v3s16 facedir_rotate(u8 facedir, v3s16 dir)

src/tile.cpp

@@ -477,6 +477,7 @@ void TextureSource::buildMainAtlas()
 	sourcelist.push_back("water.png");
 	sourcelist.push_back("leaves.png");
 	sourcelist.push_back("mud.png^grass_side.png");
+	sourcelist.push_back("cobble.png");
 	
 	sourcelist.push_back("stone.png^mineral_coal.png");
 	sourcelist.push_back("stone.png^mineral_iron.png");