code: function compileSass() {
    var stream = gulp.src(src.scss)
      .pipe(plugins.sourcemaps.init())
      .pipe(plugins.sass().on('error', plugins.sass.logError))
      .pipe(plugins.autoprefixer({ browsers: ['last 2 versions', 'ie >= 9'] }))
      .pipe(plugins.sourcemaps.write())
      .pipe(gulp.dest(compiled.css))
      .pipe(reload({ stream: true }));
    return stream;
  }
docs: compile sass and apply autoprefixer