Move to Symfony Flex

The structure changed completely.
Bundles are gone. Everything is flatten in the folder `src`.
I separated import & api controllers to avoid _pollution_ in the main controller folder.

tests/Controller/Import/ImportControllerTest.php

@@ -0,0 +1,29 @@
+<?php
+
+namespace App\Tests\Controller\Import;
+
+use App\Tests\WallabagCoreTestCase;
+
+class ImportControllerTest extends WallabagCoreTestCase
+{
+    public function testLogin()
+    {
+        $client = $this->getTestClient();
+
+        $client->request('GET', '/import');
+
+        $this->assertSame(302, $client->getResponse()->getStatusCode());
+        $this->assertStringContainsString('login', $client->getResponse()->headers->get('location'));
+    }
+
+    public function testImportList()
+    {
+        $this->logInAs('admin');
+        $client = $this->getTestClient();
+
+        $crawler = $client->request('GET', '/import');
+
+        $this->assertSame(200, $client->getResponse()->getStatusCode());
+        $this->assertSame(10, $crawler->filter('blockquote')->count());
+    }
+}