gulp.task('compress_admin', ['browserify'], function (cb) {

    var files = [
        './assets/admin/js/bundle.js',
    ];


    var options = {
        //preserveComments: 'all',
        mangle: false
    };

    pump([
            gulp.src(files),
            uglify(options),
            rename({ suffix: '.min' }),
            gulp.dest('./assets/admin/js/')
        ],
        cb
    );
});