gulpfile.js

var gulp         = require('gulp'), // Gulp
    jade         = require('gulp-jade'), // Jade
    stylus       = require('gulp-stylus'), // Stylus
    autoprefixer = require('gulp-autoprefixer'), // Autoprefixer
    csso         = require('gulp-csso'), // CSSO
    imagemin     = require('gulp-imagemin'), // Imagemin
    concat       = require('gulp-concat'), // Concat
    cache        = require('gulp-cache'); // Cache
    browsersync  = require('browser-sync'); // Browser-Sync


var dev_path =
  {
    stylus: ['dev/stylus/*.styl', '!dev/stylus/_*.styl'],
    jade:   ['dev/jade/*.jade', '!dev/jade/_*.jade'],
    js:     ['dev/js/**/*.js', '!dev/js/vendor/*.js'],
    images: 'dev/img/**/*'
  }


var build_path =
  {
    css:    'build/css/',
    html:   'build/',
    js:     'build/js/',
    images: 'build/img'
  }










// Compile Jade
gulp.task('jade', function(){
  return gulp.src(dev_path.jade)
    .pipe(jade({pretty: true}))
    .on('error', console.log)
    .pipe(gulp.dest(build_path.html))
    .pipe(browsersync.reload({stream: true}))
});


// Compile Stylus
gulp.task('stylus', function(){
  return gulp.src(dev_path.stylus)
    .pipe(stylus())
    .on('error', console.log)
    .pipe(autoprefixer())
    .pipe(gulp.dest(build_path.css))
    .pipe(browsersync.reload({stream: true}))
});
 

// Minification JavaScript
gulp.task('js', function(){
  return gulp.src(dev_path.js)
    .pipe(concat('main.js'))
    .on('error', console.log)
    .pipe(gulp.dest(build_path.js))
    .pipe(browsersync.reload({stream: true}))
});


// Minification Images
gulp.task('images', function(){
  return gulp.src(dev_path.images)
    .pipe(cache(imagemin({ optimizationLevel: 3 })))
    .pipe(gulp.dest(build_path.images))
    .pipe(browsersync.reload({stream: true}))
});


// Start Browser-Sync server
gulp.task('browsersync-server', function(){
  return browsersync.init(null, {server: {baseDir: 'build/'}})
});










//
// WATCH TASK
//

gulp.task('watch', function(){
  gulp.watch('dev/jade/*.jade', ['jade']);
  gulp.watch('dev/stylus/**/*.styl', ['stylus']);
  gulp.watch(dev_path.images, ['images']);
  gulp.watch(dev_path.js, ['js']);
});




//
// DEFAULT TASK
//

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

  gulp.src('dev/stylus/vendor/*').pipe(gulp.dest('build/css/'));
  gulp.src('dev/js/vendor/*').pipe(gulp.dest('build/js/'));
  gulp.src('dev/fonts/*').pipe(gulp.dest('build/fonts/'));

  gulp.start('jade', 'stylus', 'images', 'js', 'browsersync-server', 'watch');

});

Nice setup... almost exactly the same as mine :-)