gulpfile.js

var gulp= require('gulp');
var sass= require('gulp-sass');
var autoprefixer= require('gulp-autoprefixer');
var concat=require('gulp-concat');
var uglify=require('gulp-uglify');

gulp.task('default',function(){

});
gulp.task('styles',function(){

    gulp.src('sass/**/*.scss')
    .pipe(sass().on('error',sass.logError))
    .pipe(autoprefixer({
        browsers: ['last 2 versions']        
    }))
    .pipe(sass({outputStyle: 'compressed'}))
    .pipe(gulp.dest('./css'));

});

gulp.task('scripts',function(){
    gulp.src('js/**/*.js')
    .pipe(concat('all.js'))
    .pipe(gulp.dest('./js'));
});
gulp.task('scripts-dist',function(){
    gulp.src('js/**/*.js')
    .pipe(concat('all.js'))
    .pipe(uglify())
    .pipe(gulp.dest('./js'));
});