title: Specifying "folder" option does not upload image to folder in Cloudinary
body: <p>I'm having some difficulty getting uploads to the correct folder. If I specify:</p>
  
  <pre><code>cloudinary.uploader.upload(filePath, {
    folder: 'test-directory'
  });
  </code></pre>
  
  <p>I'm following the Node integration guide at: <a href="http://cloudinary.com/documentation/image_upload_api_reference#upload" rel="nofollow noreferrer">http://cloudinary.com/documentation/image_upload_api_reference#upload</a></p>
  
  <p>I created the "test-directory" ahead of time. The image uploads successfully, but always goes to the root of my media library.</p>
  
  <p>I have "auto create folders" enabled in my account settings.</p>
  
  <p>Here's a sample upload response from Cloudinary:</p>
  
  <pre><code>{
    public_id: 'we1yjvlpxc1qtuf1oaqe',
    version: 1503236713,
    signature: '37edbc2b19ea72b75298acce8075f9e8ddb12d09',
    width: 675,
    height: 37,
    format: 'jpg',
    resource_type: 'image',
    created_at: '2017-08-20T13:45:13Z',
    tags: [],
    bytes: 602,
    type: 'upload',
    etag: 'b5522ae652340881b213c46c035d0aed',
    url: 'http://res.cloudinary.com/alsoicode/image/upload/v1503236713/we1yjvlpxc1qtuf1oaqe.jpg',
    secure_url: 'https://res.cloudinary.com/alsoicode/image/upload/v1503236713/we1yjvlpxc1qtuf1oaqe.jpg',
    original_filename: 'test_r6_c1'
  }
  </code></pre>
  
  <p>I have also tried adding the folder name to the <code>public_id</code> option, but that hasn't worked either.</p>
  
  <p>What am I doing wrong?</p>