title: Hot to Find and close all $MdDialog s?
body: <p>I have a timer in my app. If the time is up it's transfer user to login page. 
  How to detect if the MdDialog is open and close it?
  I don't want to use <code>angular.element(document).find('md-dialod').remove()</code> - because some elements like <code>md-backdrop</code> or smth else stil exists.
  Is there any solutions for this situations?</p>