title: How to zip up zip files using Gulp Zip
body: <p>I've started using Gulp JS and must admit I'm finding it really useful.</p>
  
  <p>One of the tasks I need to perform is zip up a collection of folders into individual zip files, one for each folder and then zip all this zipped files up into one single zip file.  Using Gulp-Zip I've managed to get this far:</p>
  
  <pre><code>var modelFolders = [
          'ELFH_Check',
          'ELFH_DDP',
          'ELFH_Free'
  ];
  
  gulp.task('zipModels', function () {
  
          for (var i = 0; i &lt; modelFolders.length; i++) {
  
              var model = modelFolders[i];
  
              gulp.src('**/*', {cwd: path.join(process.cwd(), '/built_templates/' + model) })
              .pipe(zip(model + '.zip'))
              .pipe(gulp.dest('./built_templates'));
  
          };
  
  });
  </code></pre>
  
  <p>This works and outputs ELFH_Check.zip, ELFH_DDP.zip and ELFH_Free.zip.  However, I then need to zip up these zip files into one zip file called "Templates.zip" and I've not managed to get this task to work:</p>
  
  <pre><code>// zip up model files
  gulp.task('zipTemplate', ['zipModels'], function () {  
  
          gulp.src('*.zip', {cwd: path.join(process.cwd(), './built_templates/') })
                 .pipe(zip('Templates_.zip'))
                 .pipe(gulp.dest('./built_templates'));
  
  });
  </code></pre>
  
  <p>Does anyone know if this is possible or what I'm doing wrong?</p>