Enable OTP 2FA

- Update SchebTwoFactorBundle to version 3
- Enable Google 2fa on the bundle
- Disallow ability to use both email and google as 2fa
- Update Ocramius Proxy Manager to handle typed function & attributes (from PHP 7)
- use `$this->addFlash` shortcut instead of `$this->get('session')->getFlashBag()->add`
- update admin to be able to create/reset the 2fa

tests/Wallabag/CoreBundle/Controller/SecurityControllerTest.php

@@ -26,7 +26,7 @@ class SecurityControllerTest extends WallabagCoreTestCase
         $this->assertContains('config.form_rss.description', $crawler->filter('body')->extract(['_text'])[0]);
     }
 
-    public function testLoginWith2Factor()
+    public function testLoginWith2FactorEmail()
     {
         $client = $this->getClient();
 
@@ -42,7 +42,7 @@ class SecurityControllerTest extends WallabagCoreTestCase
         $user = $em
             ->getRepository('WallabagUserBundle:User')
             ->findOneByUsername('admin');
-        $user->setTwoFactorAuthentication(true);
+        $user->setEmailTwoFactor(true);
         $em->persist($user);
         $em->flush();
 
@@ -54,12 +54,12 @@ class SecurityControllerTest extends WallabagCoreTestCase
         $user = $em
             ->getRepository('WallabagUserBundle:User')
             ->findOneByUsername('admin');
-        $user->setTwoFactorAuthentication(false);
+        $user->setEmailTwoFactor(false);
         $em->persist($user);
         $em->flush();
     }
 
-    public function testTrustedComputer()
+    public function testLoginWith2FactorGoogle()
     {
         $client = $this->getClient();
 
@@ -69,15 +69,27 @@ class SecurityControllerTest extends WallabagCoreTestCase
             return;
         }
 
+        $client->followRedirects();
+
         $em = $client->getContainer()->get('doctrine.orm.entity_manager');
         $user = $em
             ->getRepository('WallabagUserBundle:User')
             ->findOneByUsername('admin');
+        $user->setGoogleAuthenticatorSecret('26LDIHYGHNELOQEM');
+        $em->persist($user);
+        $em->flush();
 
-        $date = new \DateTime();
-        $user->addTrustedComputer('ABCDEF', $date->add(new \DateInterval('P1M')));
-        $this->assertTrue($user->isTrustedComputer('ABCDEF'));
-        $this->assertFalse($user->isTrustedComputer('FEDCBA'));
+        $this->logInAsUsingHttp('admin');
+        $crawler = $client->request('GET', '/config');
+        $this->assertContains('scheb_two_factor.trusted', $crawler->filter('body')->extract(['_text'])[0]);
+
+        // restore user
+        $user = $em
+            ->getRepository('WallabagUserBundle:User')
+            ->findOneByUsername('admin');
+        $user->setGoogleAuthenticatorSecret(null);
+        $em->persist($user);
+        $em->flush();
     }
 
     public function testEnabledRegistration()