title: How to disable back button when use ionic modal on android?
body: <p>I try to disable back button on android device with "keyboard: false" but it not work.</p>
  
  <pre><code>$ionicModal.fromTemplateUrl('templates/login.html', {
    scope: $scope,
    keyboard: false
  })
  </code></pre>
  
  <p>How to disable it.
  Thank you.</p>