index.js
function (options) {

        var me = this;

        return me.custom(function (file, callback) {

            cssDependencies(file, me, options);

            callback();

        });
    }
function (options) {

        var me = this;

        return me.custom(function (file, callback) {

            cssDependencies(file, me, options);

            callback();

        });
    }
获取 css 文件的依赖

@param {Object} options
@property {Function} options.process
@property {Function} options.rename