code: function buildStyles() {
  	var stylus = require('gulp-stylus');
  	var utilus = require('./');
  	var sourcemaps = require('gulp-sourcemaps');
  	return gulp.src('./test/index.styl')
  		.pipe(sourcemaps.init())
  		.pipe(stylus({use: utilus()}))
  		.pipe(sourcemaps.write())
  		.pipe(gulp.dest(cfg.destination));
  }
docs: build styles