Браузер-Синхронизация файлов CSS Кэш?

var gulp = require('gulp'),
    sass = require('gulp-ruby-sass'),
    autoprefixer = require('gulp-autoprefixer'),
    notify = require('gulp-notify'),
    cache = require('gulp-cache'),
    browserSync = require('browser-sync').create(),
    reload = browserSync.reload;

// processing sass into css - 'gulp styles'
gulp.task('styles', function() {
    return sass('css/*.scss', {
        style: 'compressed'
    })
        .pipe(autoprefixer('last 3 version'))
        .on('error', function (err) { console.log(err.message); })
        .pipe(gulp.dest('css'))
        .pipe(reload({stream: true}));
        /*.pipe(notify({ message: 'Styles task complete' }));*/
});

// listening for changes to scss and images - 'gulp watch'
gulp.task('watch', function() {
    gulp.watch('css/**/*.scss', ['styles']);
});

// live reload via browser-sync - 'gulp serve'
gulp.task('serve', function() {
    browserSync.init({
        browser: "Firefox",
        open: "external",
        proxy: "localhost:8888",
        startPath: "fatfree-master"
    });
    gulp.watch("css/**/*.scss", ['styles']);
    gulp.watch([
        "app/views/**/*.html",
        "**/*.php",
        "**/*.ini"
    ]).on('change', reload);
});

// default tasks enacted by typing 'gulp'
gulp.task('default', function() {
    gulp.start('styles');
});