bower.json

{
  "name": "gulp-test",
  "version": "0.0.0",
  "authors": [
    "featZima <featzima@gmail.com>"
  ],
  "license": "MIT",
  "ignore": [
    "**/.*",
    "node_modules",
    "bower_components",
    "test",
    "tests"
  ]
}

gulpfile.js

var Combine = require('stream-combiner'),
    gulp = require('gulp'),
    gutil = require('gulp-util'),
    plumber = require('gulp-plumber'),
    sass = require('gulp-ruby-sass'),
    gulpFilter = require('gulp-filter'),
    watch = require('gulp-watch');

gulp.task('sass', function () {
	gulp.src('css/*.scss')
	.pipe(watch())
    .pipe(plumber({errorHandler: function (err) {  
		gutil.beep();
	}}))
	.pipe(sass())
	.pipe(gulpFilter('*.css'))
	.pipe(gulp.dest('css/'));
});

gulp.task('default', ['sass'], function () {
});

package.json

{
  "name": "gulp-test",
  "version": "0.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo \"Error: no test specified\" && exit 1"
  },
  "author": [
    "featZima <featzima@gmail.com>"
  ],
  "license": "BSD-2-Clause",
  "dependencies": {
    "gulp": "~3.6.0",
    "gulp-ruby-sass": "~0.4.1",
    "stream-combiner": "0.0.4",
    "gulp-util": "~2.2.14",
    "gulp-plumber": "~0.5.6",
    "gulp-filter": "~0.3.1",
    "gulp-watch": "~0.5.3"
  }
}