Simple glupfile.js

gulpfile.js

var gulp		= require('gulp'),
	concat 		= require('gulp-concat'),
	prefix 		= require('gulp-autoprefixer'),
	sass 		= require('gulp-sass')
	cleancss 	= require('gulp-clean-css'),
	uglify 		= require('gulp-uglify'),
	rename 		= require('gulp-rename'),
	notify 		= require('gulp-notify');

var cssDir = 'public/assets/css',
	jsDir = 'public/assets/js';

gulp.task('css', function(){
	gulp.src(['assets/bootstrap.css', 'assets/style.css'])
		.pipe(cleancss())
		.pipe(prefix('last 1 version'))
        .pipe(concat('styles.min.css'))
        .pipe(gulp.dest(cssDir))
        .pipe(notify({ message: "Site CSS Processed"}));
});

gulp.task('css', function(){
	gulp.src(['assets/jquery.min.js', 'assets/script.js'])
		.pipe(uglify({mangle: false}))
		.pipe(prefix('last 1 version'))
        .pipe(concat('script.min.js'))
        .pipe(gulp.dest(jsDir))
        .pipe(notify({ message: "Site Js Processed"}));
});

gulp.task('default', function(){
	gulp.run('css', 'js');

	gulp.watch("assets/*.css", function(event){
		gulp.run('css');
	});

	gulp.watch("assets/*.js", function(event){
		gulp.run('js');
	});
});

package.json

{
  "name": "cinemaxx",
  "version": "0.0.1",
  "description": "Cinemaxx Frontend",
  "author": "@edwinlab",
  "devDependencies": {
    "gulp": "~3.9.1",
    "gulp-concat": "~2.6.0",
    "gulp-sass": "~2.2.0",
    "gulp-uglify": "~1.5.3",
    "gulp-clean-css": "~2.0.3",
    "gulp-notify": "~2.2.0",
    "gulp-rename": "~1.2.2",
    "gulp-autoprefixer": "~3.1.0"
  }
}