title: File path without domain name from wp_get_attachment_url()
body: <p>wp_get_attachment_url() process full file path like </p>
  
  <pre><code>http://example.com/wp-content/uploads/2014/12/aura.mp3
  </code></pre>
  
  <p>I want the url without <code>http://example.com/</code>
  So, I want above example as <code>wp-content/uploads/2014/12/aura.mp3</code> instead of <code>http://example.com/wp-content/uploads/2014/12/aura.mp3</code>. How to do it? </p>