gulp-concat-css
Concatenate css files, rebasing urls and inlining @import.
Install with npm.
npm install --save-dev gulp-concat-css
var gulp = require('gulp');
var concatCss = require('gulp-concat-css');
var cloneSink = clone();
gulp.task('default', function () {
gulp.src('assets/**/*.css')
.pipe(concatCss("styles/bundle.css"))
.pipe(gulp.dest('out/'));
});
MIT @ Mario Casciaro