title: ui.bootstrap popover-is-open doesn't work properly
body: <p>I want not to show ui.bootstrap popover by using popover-is-open directive. For example, in template:</p>
  
  <pre><code>  &lt;button class="fa fa-link add-link" 
      uib-popover="popover" 
      popover-is-open="isOpen"&gt; Show popover &lt;/i&gt;
  </code></pre>
  
  <p>And in controller:</p>
  
  <pre><code>angular.module('demoModule').controller('PopoverDemoCtrl', function ($scope) {
    $scope.isOpen = false;      
  });
  </code></pre>
  
  <p>See <a href="http://plnkr.co/edit/gnXOgSgdjAiCiFbINGBp?p=preview" rel="noreferrer">plunkr</a></p>
  
  <p>I am expecting that popover should never be opened, but it opens on click on it. It seems that popover-is-open affects only first angular compiling. Any ideas?</p>
  
  <p><strong>upd:</strong> Actually, i want not to show popover only in some cases, in other cases it should be shown. For example, i have download-dialog popover and i want to show it only if size of file is greater than some limit.</p>