title: How to close the filepicker.io widget?
body: <p>When using filepicker.io is there a function in the API to close the widget properly or do we need to trigger a click on the <code>x</code> link or on the background?</p>
  
  <p>We want to detect when user presses <kbd>ESC</kbd> or <kbd>TAB</kbd> key and close the widget when this happens.</p>