title: Gulp watch...isn't watching?
body: <p>I am setting up my gulp.js file and everything is working fine except for gulp.watch. When I run "gulp" in the terminal, gulp runs through each task but doesn't watch for changes. Is there something I should change?</p>
  
  <pre><code>var gulp = require('gulp'),
      sass = require('gulp-ruby-sass'),
      autoprefixer = require('gulp-autoprefixer'),
      minifycss = require('gulp-minify-css'),
      jshint = require('gulp-jshint'),
      uglify = require('gulp-uglify'),
      imagemin = require('gulp-imagemin'),
      rename = require('gulp-rename'),
      concat = require('gulp-concat'),
      notify = require('gulp-notify'),
      cache = require('gulp-cache'),
      livereload = require('gulp-livereload'),
      del = require('del');
  
  // Styles
  gulp.task('styles', function() {
    return gulp.src('src/css/main.scss')
      .pipe(sass({ style: 'expanded', }))
      .pipe(autoprefixer('last 2 version', 'safari 5', 'ie 8', 'ie 9', 'opera 12.1', 'ios 6', 'android 4'))
      .pipe(gulp.dest('build/css'))
      .pipe(rename({ suffix: '.min' }))
      .pipe(minifycss())
      .pipe(gulp.dest('build/css'))
      .pipe(notify({ message: 'Styles task complete' }));
  });
  
  // Scripts
  gulp.task('scripts', function() {
    return gulp.src('src/scripts/**/*.js')
      .pipe(jshint.reporter('default'))
      .pipe(concat('main.js'))
      .pipe(gulp.dest('build/scripts'))
      .pipe(rename({ suffix: '.min' }))
      .pipe(uglify())
      .pipe(gulp.dest('build/scripts'))
      .pipe(notify({ message: 'Scripts task complete' }));
  });
  
  // Images
  gulp.task('images', function() {
    return gulp.src('src/images/**/*')
      .pipe(cache(imagemin({ optimizationLevel: 3, progressive: true, interlaced: true })))
      .pipe(gulp.dest('build/images'))
      .pipe(notify({ message: 'Images task complete' }));
  });
  
  
  // Default task
  gulp.task('default', function() {
      gulp.start('styles', 'scripts', 'images');
  });
  
  // Watch
  gulp.task('watch', function() {
  
    // Watch .scss files
    gulp.watch('src/styles/**/*.scss', ['styles']);
  
    // Watch .js files
    gulp.watch('src/scripts/**/*.js', ['scripts']);
  
    // Watch image files
    gulp.watch('src/images/**/*', ['images']);
  
    // Create LiveReload server
    livereload.listen();
  
    // Watch any files in dist/, reload on change
    gulp.watch(['build/**']).on('change', livereload.changed);
  
  });
  </code></pre>