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.

migrations/Version20161024212538.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace DoctrineMigrations;
+
+use App\Doctrine\WallabagMigration;
+use Doctrine\DBAL\Schema\Schema;
+
+/**
+ * Added user_id column on oauth2_clients to prevent users to delete API clients from other users.
+ */
+class Version20161024212538 extends WallabagMigration
+{
+    private $constraintName = 'IDX_user_oauth_client';
+
+    public function up(Schema $schema): void
+    {
+        $clientsTable = $schema->getTable($this->getTable('oauth2_clients'));
+
+        $this->skipIf($clientsTable->hasColumn('user_id'), 'It seems that you already played this migration.');
+
+        $clientsTable->addColumn('user_id', 'integer', ['notnull' => false]);
+
+        $clientsTable->addForeignKeyConstraint(
+            $this->getTable('user'),
+            ['user_id'],
+            ['id'],
+            ['onDelete' => 'CASCADE'],
+            $this->constraintName
+        );
+    }
+
+    public function down(Schema $schema): void
+    {
+        $clientsTable = $schema->getTable($this->getTable('oauth2_clients'));
+
+        $this->skipIf(!$clientsTable->hasColumn('user_id'), 'It seems that you already played this migration.');
+
+        $clientsTable->dropColumn('user_id', 'integer');
+
+        if ('sqlite' !== $this->connection->getDatabasePlatform()->getName()) {
+            $clientsTable->removeForeignKey($this->constraintName);
+        }
+    }
+}