title: Gulp doesn't create css file
body: <p>Gulp doesn't create css file from scss file.
  I've been searching for solution for quite some time and I didn't find it.
  Here's my gulpfile.js:</p>
  
  <pre><code>    var gulp = require('gulp');
  var shortColor = require('postcss-short-color');
  var postcss = require('gulp-postcss');
  var autoprefixer = require('autoprefixer');
  var cssnext = require('postcss-cssnext');
  var shortcss = require('postcss-short');
  var sass =require('gulp-sass');
  
  gulp.task('default', function() {
      var plugins = [
      sass,
      shortColor,
      shortcss,
      cssnext,
      autoprefixer({browsers: ['&gt; 1%'], cascade: false})
    ];
  
    return gulp.src('./base/style.scss')
    .pipe(sass())
    .pipe(postcss(plugins))
    .pipe(gulp.dest('/css/'));
  });
  
  gulp.task('watch:styles' , function(){
      gulp.watch('**/*.scss' , ['default'])
  });
  </code></pre>
  
  <p>I don't know what's wrong :(
  By the way, sorry for my English.</p>