old_contents: var gulp = require('gulp');
  var shell = require('gulp-shell');
  var webserver = require('gulp-webserver');
  
  gulp.task('default', shell.task([
    'rm -rf src/lib',
    'git clone https://github.com/angular/quickstart.git src/lib',
    'cd src/lib',
    'rm -rf .git',
    'cd ../..'
  ]));
  
  gulp.task('serve', function() {
    gulp.src('src')
      .pipe(webserver({
        open: true
      }));
  });
new_contents: var gulp = require('gulp');
  var shell = require('gulp-shell');
  var webserver = require('gulp-webserver');
  
  // install required dependencies
  gulp.task('default', shell.task([
    'rm -rf src/lib',
    'git clone https://github.com/angular/quickstart.git src/lib',
    'cd src/lib',
    'rm -rf .git',
    'cd ../..'
  ]));
  
  // serve the src folder
  gulp.task('serve', function() {
    gulp.src('src')
      .pipe(webserver({
        open: true
      }));
  });
  
subject: comment gulp commands