gulp rev manifest 添加目录前缀

"index.css": "index.css?v=04aff97a7b",

"css/index.css": "css/index.css?v=04aff97a7b",

opts = objectAssign({
		path: 'rev-manifest.json',
		merge: false,
		// Apply the default JSON transformer.
		// The user can pass in his on transformer if he wants. The only requirement is that it should
		// support 'parse' and 'stringify' methods.
		transformer: JSON,
		pwd_base: '' //增加一级目录
	}, opts, pth);

originalFile = opts.pwd_base + originalFile;

.pipe(rev.manifest({ pwd_base: 'css/' }))