gulp rev manifest 添加目录前缀

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gulp-rev 生成的manifest默认为：

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

为避免同名文件覆盖版本号，对替换的路径增加一级目录，如下

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

修改gulp-rev下index.js，

123行增加manifest传入参数:

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);

146行增加：

originalFile = opts.pwd_base + originalFile;

gulp文件配置增加目录：

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