old_contents: var gulp          = require('gulp');
  var gulpUtil      = require('gulp-util');
  
  var gulpIf        = require('gulp-if');
  var browserSync   = require('browser-sync').create();
  var uglify        = require('gulp-uglify');
  var sass          = require('gulp-ruby-sass');
  var jshint        = require('gulp-jshint');
  var jshintStylish = require('jshint-stylish');
  var useref        = require('gulp-useref');
  var imagemin      = require('gulp-imagemin');
  var del           = require('del');
  
  // Tasks
  
  
  gulp.task('build:sass', function () {
    return sass('scss/main.scss')
      .on('error', sass.logError)
      .pipe(gulp.dest('_site/css'));
  });
  
new_contents: var gulp          = require('gulp');
  var gulpUtil      = require('gulp-util');
  
  var gulpIf        = require('gulp-if');
  var browserSync   = require('browser-sync').create();
  var uglify        = require('gulp-uglify');
  var sass          = require('gulp-ruby-sass');
  var jshint        = require('gulp-jshint');
  var jshintStylish = require('jshint-stylish');
  var useref        = require('gulp-useref');
  var imagemin      = require('gulp-imagemin');
  var del           = require('del');
  
  // Tasks
  
  
  gulp.task('build:sass', function () {
    return sass('scss/main.scss', { sourcemap: true })
      .on('error', sass.logError)
      .pipe(gulp.dest('_site/css'));
      .pipe(sourcemaps.write('maps', {
        includeContent: false,
        sourceRoot: 'source'
      }))
  });
  
subject: Add compressed style to sass build