title: cordova-plugin-facebook4 ionic facebookConnectPlugin is not defined
body: <p>I'm working on ionic project and i have installed this plugin cordova-plugin-facebook4
  but when  i'm trying to use it in controller</p>
  
  <pre><code>    .controller('LoginCtrl', function($scope) {
          console.log ("dzdqsdqs");
  
      $scope.login=function() {
        console.log ("dzdqsdqs");
              facebookConnectPlugin.login(['email'], function(response) {
                  alert('Logged in');
                  alert(JSON.stringify(response.authResponse));
              }, function(error){
                  alert(error);
              })
          }
  })
  </code></pre>
  
  <p>I got this error : 
  ReferenceError: facebookConnectPlugin is not defined</p>