old_contents: var gulp = require('gulp');
    watch = require('gulp-watch'),
    rename = require('gulp-rename'),
    notify = require('gulp-notify'),
    util = require('gulp-util'),
    plumber = require('gulp-plumber'),
    concat = require('gulp-concat'),
  
    jshint = require('gulp-jshint'),
    jscs = require('gulp-jscs'),
    uglify = require('gulp-uglify'),
    sourcemaps = require('gulp-sourcemaps'),
  
    cache = require('gulp-cached'),
  
    stylus = require('gulp-stylus'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    swiss = require('kouto-swiss'),
  
    imagemin = require('gulp-imagemin');
  
  function errorNotify(error){
    notify.onError("Error: <%= error.message %>")
    util.log(util.colors.red('Error'), error.message);
  }
  
  // JAVASCRIPT
  
  gulp.task('javascript', function() {
    gulp.src('js/main.js')
    .pipe(sourcemaps.init())
    .pipe(jshint())
    .pipe(jshint.reporter('jshint-stylish'))
    .pipe(jscs('.jscsrc'))
    .on('error', errorNotify)
    .pipe(uglify())
    .on('error', errorNotify)
    .pipe(rename({suffix: '.min'}))
    .pipe(sourcemaps.write('/'))
    .on('error', errorNotify)
    .pipe(gulp.dest('js'))
    .pipe(notify({ message: 'Javascript task complete' }));
  });
  
  gulp.task('javascript-library', function() {
    gulp.src('js/library/*.js')
    .pipe(concat('library.js'))
    .pipe(gulp.dest('js'))
    .pipe(notify({ message: 'Javascript Library task complete' }));
  });
  
  // STYLES
  
  gulp.task('style', function() {
    return gulp.src('css/site.styl')
    .pipe(plumber())
    .pipe(stylus({
        use: [
          swiss()
        ],
      }))
    .on('error', errorNotify)
    .pipe(autoprefixer())
    .on('error', errorNotify)
    .pipe(gulp.dest('css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(minifycss())
    .on('error', errorNotify)
    .pipe(gulp.dest('css'))
    .pipe(notify({ message: 'Style task complete' }));
  });
  
  // IMAGES
  
  gulp.task('images', function () {
    return gulp.src('img/src/*.*')
    .pipe(cache('images'))
    .pipe(imagemin({
      progressive: false
    }))
    .on('error', errorNotify)
    .pipe(gulp.dest('img/dist'))
  	.pipe(notify({ message: 'Images task complete' }));
  });
  
  // TASKS
  
  gulp.task('watch', function() {
    gulp.watch(['js/main.js'], ['javascript']);
    gulp.watch(['js/library/*.js'], ['javascript-library']);
    gulp.watch(['css/site.styl'], ['style']);
    gulp.watch(['img/src/*.*'], ['images']);
  });
  
  gulp.task('build', ['style', 'javascript', 'javascript-library']);
  gulp.task('default', ['watch']);
  
new_contents: var gulp = require('gulp');
    watch = require('gulp-watch'),
    rename = require('gulp-rename'),
    notify = require('gulp-notify'),
    util = require('gulp-util'),
    plumber = require('gulp-plumber'),
    concat = require('gulp-concat'),
  
    jshint = require('gulp-jshint'),
    jscs = require('gulp-jscs'),
    uglify = require('gulp-uglify'),
    sourcemaps = require('gulp-sourcemaps'),
  
    cache = require('gulp-cached'),
  
    stylus = require('gulp-stylus'),
    autoprefixer = require('gulp-autoprefixer'),
    minifycss = require('gulp-minify-css'),
    swiss = require('kouto-swiss'),
  
    imagemin = require('gulp-imagemin');
  
  function errorNotify(error){
    notify.onError("Error: <%= error.message %>")
    util.log(util.colors.red('Error'), error.message);
  }
  
  // JAVASCRIPT
  
  gulp.task('javascript', function() {
    gulp.src('js/main.js')
    .pipe(sourcemaps.init())
    .pipe(jshint())
    .pipe(jshint.reporter('jshint-stylish'))
    .pipe(jscs('.jscsrc'))
    .on('error', errorNotify)
    .pipe(uglify())
    .on('error', errorNotify)
    .pipe(rename({suffix: '.min'}))
    .pipe(sourcemaps.write('/'))
    .on('error', errorNotify)
    .pipe(gulp.dest('js'))
    .pipe(notify({ message: 'Javascript task complete' }));
  });
  
  gulp.task('javascript-library', function() {
    gulp.src('js/library/*.js')
    .pipe(concat('library.js'))
    .pipe(gulp.dest('js'))
    .pipe(notify({ message: 'Javascript Library task complete' }));
  });
  
  // STYLES
  
  gulp.task('style', function() {
    return gulp.src('css/site.styl')
    .pipe(plumber())
    .pipe(stylus({
        use: [
          swiss()
        ],
      }))
    .on('error', errorNotify)
    .pipe(autoprefixer())
    .on('error', errorNotify)
    .pipe(gulp.dest('css'))
    .pipe(rename({suffix: '.min'}))
    .pipe(minifycss())
    .on('error', errorNotify)
    .pipe(gulp.dest('css'))
    .pipe(notify({ message: 'Style task complete' }));
  });
  
  // IMAGES
  
  gulp.task('images', function () {
    return gulp.src('img/src/*.*')
    .pipe(cache('images'))
    .pipe(imagemin({
      progressive: false
    }))
    .on('error', errorNotify)
    .pipe(gulp.dest('img/dist'))
  	.pipe(notify({ message: 'Images task complete' }));
  });
  
  // TASKS
  
  gulp.task('watch', function() {
    gulp.watch(['js/main.js'], ['javascript']);
    gulp.watch(['js/library/*.js'], ['javascript-library']);
    gulp.watch(['css/*.styl', 'css/responsive/*.styl'], ['style']);
    gulp.watch(['img/src/*.*'], ['images']);
  });
  
  gulp.task('build', ['style', 'javascript', 'javascript-library']);
  gulp.task('default', ['watch']);
  
subject: update gulp to watch responsive files