code: function(folder, dest) {
  		try {
  			fs.mkdirSync(dest, '0755');
  		} catch (e) {}
  		var files = fs.readdirSync(folder);
  		var indexFile = templatesManager.getFolderIndex(files);
  		logger.debug('Index file for "%s": "%s"', folder, indexFile);
  		files.forEach(function(file) {
  			if (config.exclude.indexOf(file) === -1) {
  				var curPath = path.join(folder, file);
  				if (fs.statSync(curPath).isDirectory()) {
  					walk(curPath, path.join(dest, file));
  				} else {
  					if (['.md', '.markdown'].indexOf(path.extname(file).toLowerCase()) !== -1) {
  						var isIndex = (file === indexFile);
  						filesToRender[curPath] = {
  							filename: file,
  							path: curPath,
  							versions: templatesManager.getVersions(curPath, 'template', isIndex),
  							isIndex: isIndex
  						};
  					} else if (config.media.indexOf(path.extname(file).toLowerCase().substr(1)) !== -1) {
  						logger.log('Copy "%s" to "%s"', curPath, path.join(dest, path.basename(curPath)));
  						fs.copy(curPath, path.join(dest, path.basename(curPath)), {replace: true}, function(err) {
  							if (err) {
  								logger.error('Problem while copying media file "%s" to "%s": "%s"', curPath, path.join(dest, path.basename(curPath)), err);
  							}
  						});
  					}
  				}
  			} else {
  				logger.debug('Excluded:', file);
  			}
  		});
  	}
docs: filename => filename, path, versions Function to discover Markdown files and copy media files