text: var gulp = require('gulp');
  var stylus = require('gulp-stylus');
  var postcss = require('gulp-postcss');
  var autoprefixer = require('autoprefixer');
  var mqpacker = require('css-mqpacker');
  var csswring = require('csswring');
  
  gulp.task('styles', function () {
      var processors = [
          autoprefixer({browsers: ['last 2 versions', '> 1%', 'ie >= 9']}),
          mqpacker,
          csswring
      ];
      return gulp.src('assets/styles/main.styl')
          .pipe(stylus())
          .pipe(postcss(processors))
          .pipe(gulp.dest('www/assets/styles'));
  });